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BigDecimal.js•34.4 kB
/**
* This module provides utility functions and type class instances for working with the `BigDecimal` type in TypeScript.
* It includes functions for basic arithmetic operations, as well as type class instances for `Equivalence` and `Order`.
*
* A `BigDecimal` allows storing any real number to arbitrary precision; which avoids common floating point errors
* (such as 0.1 + 0.2 ≠ 0.3) at the cost of complexity.
*
* Internally, `BigDecimal` uses a `BigInt` object, paired with a 64-bit integer which determines the position of the
* decimal point. Therefore, the precision *is not* actually arbitrary, but limited to 2<sup>63</sup> decimal places.
*
* It is not recommended to convert a floating point number to a decimal directly, as the floating point representation
* may be unexpected.
*
* @module BigDecimal
* @since 2.0.0
* @see {@link module:BigInt} for more similar operations on `bigint` types
* @see {@link module:Number} for more similar operations on `number` types
*/
import * as Equal from "./Equal.js";
import * as equivalence from "./Equivalence.js";
import { dual, pipe } from "./Function.js";
import * as Hash from "./Hash.js";
import { NodeInspectSymbol } from "./Inspectable.js";
import * as Option from "./Option.js";
import * as order from "./Order.js";
import { pipeArguments } from "./Pipeable.js";
import { hasProperty } from "./Predicate.js";
const DEFAULT_PRECISION = 100;
const FINITE_INT_REGEX = /^[+-]?\d+$/;
/**
* @since 2.0.0
* @category symbols
*/
export const TypeId = /*#__PURE__*/Symbol.for("effect/BigDecimal");
const BigDecimalProto = {
[TypeId]: TypeId,
[Hash.symbol]() {
const normalized = normalize(this);
return pipe(Hash.hash(normalized.value), Hash.combine(Hash.number(normalized.scale)), Hash.cached(this));
},
[Equal.symbol](that) {
return isBigDecimal(that) && equals(this, that);
},
toString() {
return `BigDecimal(${format(this)})`;
},
toJSON() {
return {
_id: "BigDecimal",
value: String(this.value),
scale: this.scale
};
},
[NodeInspectSymbol]() {
return this.toJSON();
},
pipe() {
return pipeArguments(this, arguments);
}
};
/**
* Checks if a given value is a `BigDecimal`.
*
* @since 2.0.0
* @category guards
*/
export const isBigDecimal = u => hasProperty(u, TypeId);
/**
* Creates a `BigDecimal` from a `bigint` value and a scale.
*
* @since 2.0.0
* @category constructors
*/
export const make = (value, scale) => {
const o = Object.create(BigDecimalProto);
o.value = value;
o.scale = scale;
return o;
};
/**
* Internal function used to create pre-normalized `BigDecimal`s.
*
* @internal
*/
export const unsafeMakeNormalized = (value, scale) => {
if (value !== bigint0 && value % bigint10 === bigint0) {
throw new RangeError("Value must be normalized");
}
const o = make(value, scale);
o.normalized = o;
return o;
};
const bigint0 = /*#__PURE__*/BigInt(0);
const bigint1 = /*#__PURE__*/BigInt(1);
const bigint10 = /*#__PURE__*/BigInt(10);
const zero = /*#__PURE__*/unsafeMakeNormalized(bigint0, 0);
/**
* Normalizes a given `BigDecimal` by removing trailing zeros.
*
* **Example**
*
* ```ts
* import * as assert from "node:assert"
* import { normalize, make, unsafeFromString } from "effect/BigDecimal"
*
* assert.deepStrictEqual(normalize(unsafeFromString("123.00000")), normalize(make(123n, 0)))
* assert.deepStrictEqual(normalize(unsafeFromString("12300000")), normalize(make(123n, -5)))
* ```
*
* @since 2.0.0
* @category scaling
*/
export const normalize = self => {
if (self.normalized === undefined) {
if (self.value === bigint0) {
self.normalized = zero;
} else {
const digits = `${self.value}`;
let trail = 0;
for (let i = digits.length - 1; i >= 0; i--) {
if (digits[i] === "0") {
trail++;
} else {
break;
}
}
if (trail === 0) {
self.normalized = self;
}
const value = BigInt(digits.substring(0, digits.length - trail));
const scale = self.scale - trail;
self.normalized = unsafeMakeNormalized(value, scale);
}
}
return self.normalized;
};
/**
* Scales a given `BigDecimal` to the specified scale.
*
* If the given scale is smaller than the current scale, the value will be rounded down to
* the nearest integer.
*
* @since 2.0.0
* @category scaling
*/
export const scale = /*#__PURE__*/dual(2, (self, scale) => {
if (scale > self.scale) {
return make(self.value * bigint10 ** BigInt(scale - self.scale), scale);
}
if (scale < self.scale) {
return make(self.value / bigint10 ** BigInt(self.scale - scale), scale);
}
return self;
});
/**
* Provides an addition operation on `BigDecimal`s.
*
* @example
* ```ts
* import * as assert from "node:assert"
* import { sum, unsafeFromString } from "effect/BigDecimal"
*
* assert.deepStrictEqual(sum(unsafeFromString("2"), unsafeFromString("3")), unsafeFromString("5"))
* ```
*
* @since 2.0.0
* @category math
*/
export const sum = /*#__PURE__*/dual(2, (self, that) => {
if (that.value === bigint0) {
return self;
}
if (self.value === bigint0) {
return that;
}
if (self.scale > that.scale) {
return make(scale(that, self.scale).value + self.value, self.scale);
}
if (self.scale < that.scale) {
return make(scale(self, that.scale).value + that.value, that.scale);
}
return make(self.value + that.value, self.scale);
});
/**
* Provides a multiplication operation on `BigDecimal`s.
*
* @example
* ```ts
* import * as assert from "node:assert"
* import { multiply, unsafeFromString } from "effect/BigDecimal"
*
* assert.deepStrictEqual(multiply(unsafeFromString("2"), unsafeFromString("3")), unsafeFromString("6"))
* ```
*
* @since 2.0.0
* @category math
*/
export const multiply = /*#__PURE__*/dual(2, (self, that) => {
if (that.value === bigint0 || self.value === bigint0) {
return zero;
}
return make(self.value * that.value, self.scale + that.scale);
});
/**
* Provides a subtraction operation on `BigDecimal`s.
*
* @example
* ```ts
* import * as assert from "node:assert"
* import { subtract, unsafeFromString } from "effect/BigDecimal"
*
* assert.deepStrictEqual(subtract(unsafeFromString("2"), unsafeFromString("3")), unsafeFromString("-1"))
* ```
*
* @since 2.0.0
* @category math
*/
export const subtract = /*#__PURE__*/dual(2, (self, that) => {
if (that.value === bigint0) {
return self;
}
if (self.value === bigint0) {
return make(-that.value, that.scale);
}
if (self.scale > that.scale) {
return make(self.value - scale(that, self.scale).value, self.scale);
}
if (self.scale < that.scale) {
return make(scale(self, that.scale).value - that.value, that.scale);
}
return make(self.value - that.value, self.scale);
});
/**
* Internal function used for arbitrary precision division.
*/
const divideWithPrecision = (num, den, scale, precision) => {
const numNegative = num < bigint0;
const denNegative = den < bigint0;
const negateResult = numNegative !== denNegative;
num = numNegative ? -num : num;
den = denNegative ? -den : den;
// Shift digits until numerator is larger than denominator (set scale appropriately).
while (num < den) {
num *= bigint10;
scale++;
}
// First division.
let quotient = num / den;
let remainder = num % den;
if (remainder === bigint0) {
// No remainder, return immediately.
return make(negateResult ? -quotient : quotient, scale);
}
// The quotient is guaranteed to be non-negative at this point. No need to consider sign.
let count = `${quotient}`.length;
// Shift the remainder by 1 decimal; The quotient will be 1 digit upon next division.
remainder *= bigint10;
while (remainder !== bigint0 && count < precision) {
const q = remainder / den;
const r = remainder % den;
quotient = quotient * bigint10 + q;
remainder = r * bigint10;
count++;
scale++;
}
if (remainder !== bigint0) {
// Round final number with remainder.
quotient += roundTerminal(remainder / den);
}
return make(negateResult ? -quotient : quotient, scale);
};
/**
* Internal function used for rounding.
*
* Returns 1 if the most significant digit is >= 5, otherwise 0.
*
* This is used after dividing a number by a power of ten and rounding the last digit.
*
* @internal
*/
export const roundTerminal = n => {
const pos = n >= bigint0 ? 0 : 1;
return Number(`${n}`[pos]) < 5 ? bigint0 : bigint1;
};
/**
* Provides a division operation on `BigDecimal`s.
*
* If the dividend is not a multiple of the divisor the result will be a `BigDecimal` value
* which represents the integer division rounded down to the nearest integer.
*
* If the divisor is `0`, the result will be `None`.
*
* @example
* ```ts
* import * as assert from "node:assert"
* import { BigDecimal, Option } from "effect"
*
* assert.deepStrictEqual(BigDecimal.divide(BigDecimal.unsafeFromString("6"), BigDecimal.unsafeFromString("3")), Option.some(BigDecimal.unsafeFromString("2")))
* assert.deepStrictEqual(BigDecimal.divide(BigDecimal.unsafeFromString("6"), BigDecimal.unsafeFromString("4")), Option.some(BigDecimal.unsafeFromString("1.5")))
* assert.deepStrictEqual(BigDecimal.divide(BigDecimal.unsafeFromString("6"), BigDecimal.unsafeFromString("0")), Option.none())
* ```
*
* @since 2.0.0
* @category math
*/
export const divide = /*#__PURE__*/dual(2, (self, that) => {
if (that.value === bigint0) {
return Option.none();
}
if (self.value === bigint0) {
return Option.some(zero);
}
const scale = self.scale - that.scale;
if (self.value === that.value) {
return Option.some(make(bigint1, scale));
}
return Option.some(divideWithPrecision(self.value, that.value, scale, DEFAULT_PRECISION));
});
/**
* Provides an unsafe division operation on `BigDecimal`s.
*
* If the dividend is not a multiple of the divisor the result will be a `BigDecimal` value
* which represents the integer division rounded down to the nearest integer.
*
* Throws a `RangeError` if the divisor is `0`.
*
* @example
* ```ts
* import * as assert from "node:assert"
* import { unsafeDivide, unsafeFromString } from "effect/BigDecimal"
*
* assert.deepStrictEqual(unsafeDivide(unsafeFromString("6"), unsafeFromString("3")), unsafeFromString("2"))
* assert.deepStrictEqual(unsafeDivide(unsafeFromString("6"), unsafeFromString("4")), unsafeFromString("1.5"))
* ```
*
* @since 2.0.0
* @category math
*/
export const unsafeDivide = /*#__PURE__*/dual(2, (self, that) => {
if (that.value === bigint0) {
throw new RangeError("Division by zero");
}
if (self.value === bigint0) {
return zero;
}
const scale = self.scale - that.scale;
if (self.value === that.value) {
return make(bigint1, scale);
}
return divideWithPrecision(self.value, that.value, scale, DEFAULT_PRECISION);
});
/**
* @since 2.0.0
* @category instances
*/
export const Order = /*#__PURE__*/order.make((self, that) => {
const scmp = order.number(sign(self), sign(that));
if (scmp !== 0) {
return scmp;
}
if (self.scale > that.scale) {
return order.bigint(self.value, scale(that, self.scale).value);
}
if (self.scale < that.scale) {
return order.bigint(scale(self, that.scale).value, that.value);
}
return order.bigint(self.value, that.value);
});
/**
* Returns `true` if the first argument is less than the second, otherwise `false`.
*
* @example
* ```ts
* import * as assert from "node:assert"
* import { lessThan, unsafeFromString } from "effect/BigDecimal"
*
* assert.deepStrictEqual(lessThan(unsafeFromString("2"), unsafeFromString("3")), true)
* assert.deepStrictEqual(lessThan(unsafeFromString("3"), unsafeFromString("3")), false)
* assert.deepStrictEqual(lessThan(unsafeFromString("4"), unsafeFromString("3")), false)
* ```
*
* @since 2.0.0
* @category predicates
*/
export const lessThan = /*#__PURE__*/order.lessThan(Order);
/**
* Checks if a given `BigDecimal` is less than or equal to the provided one.
*
* @example
* ```ts
* import * as assert from "node:assert"
* import { lessThanOrEqualTo, unsafeFromString } from "effect/BigDecimal"
*
* assert.deepStrictEqual(lessThanOrEqualTo(unsafeFromString("2"), unsafeFromString("3")), true)
* assert.deepStrictEqual(lessThanOrEqualTo(unsafeFromString("3"), unsafeFromString("3")), true)
* assert.deepStrictEqual(lessThanOrEqualTo(unsafeFromString("4"), unsafeFromString("3")), false)
* ```
*
* @since 2.0.0
* @category predicates
*/
export const lessThanOrEqualTo = /*#__PURE__*/order.lessThanOrEqualTo(Order);
/**
* Returns `true` if the first argument is greater than the second, otherwise `false`.
*
* @example
* ```ts
* import * as assert from "node:assert"
* import { greaterThan, unsafeFromString } from "effect/BigDecimal"
*
* assert.deepStrictEqual(greaterThan(unsafeFromString("2"), unsafeFromString("3")), false)
* assert.deepStrictEqual(greaterThan(unsafeFromString("3"), unsafeFromString("3")), false)
* assert.deepStrictEqual(greaterThan(unsafeFromString("4"), unsafeFromString("3")), true)
* ```
*
* @since 2.0.0
* @category predicates
*/
export const greaterThan = /*#__PURE__*/order.greaterThan(Order);
/**
* Checks if a given `BigDecimal` is greater than or equal to the provided one.
*
* @example
* ```ts
* import * as assert from "node:assert"
* import { greaterThanOrEqualTo, unsafeFromString } from "effect/BigDecimal"
*
* assert.deepStrictEqual(greaterThanOrEqualTo(unsafeFromString("2"), unsafeFromString("3")), false)
* assert.deepStrictEqual(greaterThanOrEqualTo(unsafeFromString("3"), unsafeFromString("3")), true)
* assert.deepStrictEqual(greaterThanOrEqualTo(unsafeFromString("4"), unsafeFromString("3")), true)
* ```
*
* @since 2.0.0
* @category predicates
*/
export const greaterThanOrEqualTo = /*#__PURE__*/order.greaterThanOrEqualTo(Order);
/**
* Checks if a `BigDecimal` is between a `minimum` and `maximum` value (inclusive).
*
* @example
* ```ts
* import * as assert from "node:assert"
* import { BigDecimal } from "effect"
*
* const between = BigDecimal.between({
* minimum: BigDecimal.unsafeFromString("1"),
* maximum: BigDecimal.unsafeFromString("5") }
* )
*
* assert.deepStrictEqual(between(BigDecimal.unsafeFromString("3")), true)
* assert.deepStrictEqual(between(BigDecimal.unsafeFromString("0")), false)
* assert.deepStrictEqual(between(BigDecimal.unsafeFromString("6")), false)
* ```
*
* @since 2.0.0
* @category predicates
*/
export const between = /*#__PURE__*/order.between(Order);
/**
* Restricts the given `BigDecimal` to be within the range specified by the `minimum` and `maximum` values.
*
* - If the `BigDecimal` is less than the `minimum` value, the function returns the `minimum` value.
* - If the `BigDecimal` is greater than the `maximum` value, the function returns the `maximum` value.
* - Otherwise, it returns the original `BigDecimal`.
*
* @example
* ```ts
* import * as assert from "node:assert"
* import { BigDecimal } from "effect"
*
* const clamp = BigDecimal.clamp({
* minimum: BigDecimal.unsafeFromString("1"),
* maximum: BigDecimal.unsafeFromString("5") }
* )
*
* assert.deepStrictEqual(clamp(BigDecimal.unsafeFromString("3")), BigDecimal.unsafeFromString("3"))
* assert.deepStrictEqual(clamp(BigDecimal.unsafeFromString("0")), BigDecimal.unsafeFromString("1"))
* assert.deepStrictEqual(clamp(BigDecimal.unsafeFromString("6")), BigDecimal.unsafeFromString("5"))
* ```
*
* @since 2.0.0
* @category math
*/
export const clamp = /*#__PURE__*/order.clamp(Order);
/**
* Returns the minimum between two `BigDecimal`s.
*
* @example
* ```ts
* import * as assert from "node:assert"
* import { min, unsafeFromString } from "effect/BigDecimal"
*
* assert.deepStrictEqual(min(unsafeFromString("2"), unsafeFromString("3")), unsafeFromString("2"))
* ```
*
* @since 2.0.0
* @category math
*/
export const min = /*#__PURE__*/order.min(Order);
/**
* Returns the maximum between two `BigDecimal`s.
*
* @example
* ```ts
* import * as assert from "node:assert"
* import { max, unsafeFromString } from "effect/BigDecimal"
*
* assert.deepStrictEqual(max(unsafeFromString("2"), unsafeFromString("3")), unsafeFromString("3"))
* ```
*
* @since 2.0.0
* @category math
*/
export const max = /*#__PURE__*/order.max(Order);
/**
* Determines the sign of a given `BigDecimal`.
*
* @example
* ```ts
* import * as assert from "node:assert"
* import { sign, unsafeFromString } from "effect/BigDecimal"
*
* assert.deepStrictEqual(sign(unsafeFromString("-5")), -1)
* assert.deepStrictEqual(sign(unsafeFromString("0")), 0)
* assert.deepStrictEqual(sign(unsafeFromString("5")), 1)
* ```
*
* @since 2.0.0
* @category math
*/
export const sign = n => n.value === bigint0 ? 0 : n.value < bigint0 ? -1 : 1;
/**
* Determines the absolute value of a given `BigDecimal`.
*
* @example
* ```ts
* import * as assert from "node:assert"
* import { abs, unsafeFromString } from "effect/BigDecimal"
*
* assert.deepStrictEqual(abs(unsafeFromString("-5")), unsafeFromString("5"))
* assert.deepStrictEqual(abs(unsafeFromString("0")), unsafeFromString("0"))
* assert.deepStrictEqual(abs(unsafeFromString("5")), unsafeFromString("5"))
* ```
*
* @since 2.0.0
* @category math
*/
export const abs = n => n.value < bigint0 ? make(-n.value, n.scale) : n;
/**
* Provides a negate operation on `BigDecimal`s.
*
* @example
* ```ts
* import * as assert from "node:assert"
* import { negate, unsafeFromString } from "effect/BigDecimal"
*
* assert.deepStrictEqual(negate(unsafeFromString("3")), unsafeFromString("-3"))
* assert.deepStrictEqual(negate(unsafeFromString("-6")), unsafeFromString("6"))
* ```
*
* @since 2.0.0
* @category math
*/
export const negate = n => make(-n.value, n.scale);
/**
* Returns the remainder left over when one operand is divided by a second operand.
*
* If the divisor is `0`, the result will be `None`.
*
* @example
* ```ts
* import * as assert from "node:assert"
* import { BigDecimal, Option } from "effect"
*
* assert.deepStrictEqual(BigDecimal.remainder(BigDecimal.unsafeFromString("2"), BigDecimal.unsafeFromString("2")), Option.some(BigDecimal.unsafeFromString("0")))
* assert.deepStrictEqual(BigDecimal.remainder(BigDecimal.unsafeFromString("3"), BigDecimal.unsafeFromString("2")), Option.some(BigDecimal.unsafeFromString("1")))
* assert.deepStrictEqual(BigDecimal.remainder(BigDecimal.unsafeFromString("-4"), BigDecimal.unsafeFromString("2")), Option.some(BigDecimal.unsafeFromString("0")))
* ```
*
* @since 2.0.0
* @category math
*/
export const remainder = /*#__PURE__*/dual(2, (self, divisor) => {
if (divisor.value === bigint0) {
return Option.none();
}
const max = Math.max(self.scale, divisor.scale);
return Option.some(make(scale(self, max).value % scale(divisor, max).value, max));
});
/**
* Returns the remainder left over when one operand is divided by a second operand.
*
* Throws a `RangeError` if the divisor is `0`.
*
* @example
* ```ts
* import * as assert from "node:assert"
* import { unsafeRemainder, unsafeFromString } from "effect/BigDecimal"
*
* assert.deepStrictEqual(unsafeRemainder(unsafeFromString("2"), unsafeFromString("2")), unsafeFromString("0"))
* assert.deepStrictEqual(unsafeRemainder(unsafeFromString("3"), unsafeFromString("2")), unsafeFromString("1"))
* assert.deepStrictEqual(unsafeRemainder(unsafeFromString("-4"), unsafeFromString("2")), unsafeFromString("0"))
* ```
*
* @since 2.0.0
* @category math
*/
export const unsafeRemainder = /*#__PURE__*/dual(2, (self, divisor) => {
if (divisor.value === bigint0) {
throw new RangeError("Division by zero");
}
const max = Math.max(self.scale, divisor.scale);
return make(scale(self, max).value % scale(divisor, max).value, max);
});
/**
* @category instances
* @since 2.0.0
*/
export const Equivalence = /*#__PURE__*/equivalence.make((self, that) => {
if (self.scale > that.scale) {
return scale(that, self.scale).value === self.value;
}
if (self.scale < that.scale) {
return scale(self, that.scale).value === that.value;
}
return self.value === that.value;
});
/**
* Checks if two `BigDecimal`s are equal.
*
* @since 2.0.0
* @category predicates
*/
export const equals = /*#__PURE__*/dual(2, (self, that) => Equivalence(self, that));
/**
* Creates a `BigDecimal` from a `bigint` value.
*
* @since 2.0.0
* @category constructors
*/
export const fromBigInt = n => make(n, 0);
/**
* Creates a `BigDecimal` from a `number` value.
*
* It is not recommended to convert a floating point number to a decimal directly,
* as the floating point representation may be unexpected.
*
* Throws a `RangeError` if the number is not finite (`NaN`, `+Infinity` or `-Infinity`).
*
* @example
* ```ts
* import * as assert from "node:assert"
* import { unsafeFromNumber, make } from "effect/BigDecimal"
*
* assert.deepStrictEqual(unsafeFromNumber(123), make(123n, 0))
* assert.deepStrictEqual(unsafeFromNumber(123.456), make(123456n, 3))
* ```
*
* @since 3.11.0
* @category constructors
*/
export const unsafeFromNumber = n => Option.getOrThrowWith(safeFromNumber(n), () => new RangeError(`Number must be finite, got ${n}`));
/**
* Creates a `BigDecimal` from a `number` value.
*
* It is not recommended to convert a floating point number to a decimal directly,
* as the floating point representation may be unexpected.
*
* Throws a `RangeError` if the number is not finite (`NaN`, `+Infinity` or `-Infinity`).
*
* @since 2.0.0
* @category constructors
* @deprecated Use {@link unsafeFromNumber} instead.
*/
export const fromNumber = unsafeFromNumber;
// TODO(4.0): Rename this to `fromNumber` after removing the current, unsafe implementation of `fromNumber`.
/**
* Creates a `BigDecimal` from a `number` value.
*
* It is not recommended to convert a floating point number to a decimal directly,
* as the floating point representation may be unexpected.
*
* Returns `None` if the number is not finite (`NaN`, `+Infinity` or `-Infinity`).
*
* @example
* ```ts
* import * as assert from "node:assert"
* import { BigDecimal, Option } from "effect"
*
* assert.deepStrictEqual(BigDecimal.safeFromNumber(123), Option.some(BigDecimal.make(123n, 0)))
* assert.deepStrictEqual(BigDecimal.safeFromNumber(123.456), Option.some(BigDecimal.make(123456n, 3)))
* assert.deepStrictEqual(BigDecimal.safeFromNumber(Infinity), Option.none())
* ```
*
* @since 3.11.0
* @category constructors
*/
export const safeFromNumber = n => {
if (!Number.isFinite(n)) {
return Option.none();
}
const string = `${n}`;
if (string.includes("e")) {
return fromString(string);
}
const [lead, trail = ""] = string.split(".");
return Option.some(make(BigInt(`${lead}${trail}`), trail.length));
};
/**
* Parses a numerical `string` into a `BigDecimal`.
*
* @example
* ```ts
* import * as assert from "node:assert"
* import { BigDecimal, Option } from "effect"
*
* assert.deepStrictEqual(BigDecimal.fromString("123"), Option.some(BigDecimal.make(123n, 0)))
* assert.deepStrictEqual(BigDecimal.fromString("123.456"), Option.some(BigDecimal.make(123456n, 3)))
* assert.deepStrictEqual(BigDecimal.fromString("123.abc"), Option.none())
* ```
*
* @since 2.0.0
* @category constructors
*/
export const fromString = s => {
if (s === "") {
return Option.some(zero);
}
let base;
let exp;
const seperator = s.search(/[eE]/);
if (seperator !== -1) {
const trail = s.slice(seperator + 1);
base = s.slice(0, seperator);
exp = Number(trail);
if (base === "" || !Number.isSafeInteger(exp) || !FINITE_INT_REGEX.test(trail)) {
return Option.none();
}
} else {
base = s;
exp = 0;
}
let digits;
let offset;
const dot = base.search(/\./);
if (dot !== -1) {
const lead = base.slice(0, dot);
const trail = base.slice(dot + 1);
digits = `${lead}${trail}`;
offset = trail.length;
} else {
digits = base;
offset = 0;
}
if (!FINITE_INT_REGEX.test(digits)) {
return Option.none();
}
const scale = offset - exp;
if (!Number.isSafeInteger(scale)) {
return Option.none();
}
return Option.some(make(BigInt(digits), scale));
};
/**
* Parses a numerical `string` into a `BigDecimal`.
*
* @example
* ```ts
* import * as assert from "node:assert"
* import { unsafeFromString, make } from "effect/BigDecimal"
*
* assert.deepStrictEqual(unsafeFromString("123"), make(123n, 0))
* assert.deepStrictEqual(unsafeFromString("123.456"), make(123456n, 3))
* assert.throws(() => unsafeFromString("123.abc"))
* ```
*
* @since 2.0.0
* @category constructors
*/
export const unsafeFromString = s => Option.getOrThrowWith(fromString(s), () => new Error("Invalid numerical string"));
/**
* Formats a given `BigDecimal` as a `string`.
*
* If the scale of the `BigDecimal` is greater than or equal to 16, the `BigDecimal` will
* be formatted in scientific notation.
*
* @example
* ```ts
* import * as assert from "node:assert"
* import { format, unsafeFromString } from "effect/BigDecimal"
*
* assert.deepStrictEqual(format(unsafeFromString("-5")), "-5")
* assert.deepStrictEqual(format(unsafeFromString("123.456")), "123.456")
* assert.deepStrictEqual(format(unsafeFromString("-0.00000123")), "-0.00000123")
* ```
*
* @since 2.0.0
* @category conversions
*/
export const format = n => {
const normalized = normalize(n);
if (Math.abs(normalized.scale) >= 16) {
return toExponential(normalized);
}
const negative = normalized.value < bigint0;
const absolute = negative ? `${normalized.value}`.substring(1) : `${normalized.value}`;
let before;
let after;
if (normalized.scale >= absolute.length) {
before = "0";
after = "0".repeat(normalized.scale - absolute.length) + absolute;
} else {
const location = absolute.length - normalized.scale;
if (location > absolute.length) {
const zeros = location - absolute.length;
before = `${absolute}${"0".repeat(zeros)}`;
after = "";
} else {
after = absolute.slice(location);
before = absolute.slice(0, location);
}
}
const complete = after === "" ? before : `${before}.${after}`;
return negative ? `-${complete}` : complete;
};
/**
* Formats a given `BigDecimal` as a `string` in scientific notation.
*
* @example
* ```ts
* import * as assert from "node:assert"
* import { toExponential, make } from "effect/BigDecimal"
*
* assert.deepStrictEqual(toExponential(make(123456n, -5)), "1.23456e+10")
* ```
*
* @since 3.11.0
* @category conversions
*/
export const toExponential = n => {
if (isZero(n)) {
return "0e+0";
}
const normalized = normalize(n);
const digits = `${abs(normalized).value}`;
const head = digits.slice(0, 1);
const tail = digits.slice(1);
let output = `${isNegative(normalized) ? "-" : ""}${head}`;
if (tail !== "") {
output += `.${tail}`;
}
const exp = tail.length - normalized.scale;
return `${output}e${exp >= 0 ? "+" : ""}${exp}`;
};
/**
* Converts a `BigDecimal` to a `number`.
*
* This function will produce incorrect results if the `BigDecimal` exceeds the 64-bit range of a `number`.
*
* @example
* ```ts
* import * as assert from "node:assert"
* import { unsafeToNumber, unsafeFromString } from "effect/BigDecimal"
*
* assert.deepStrictEqual(unsafeToNumber(unsafeFromString("123.456")), 123.456)
* ```
*
* @since 2.0.0
* @category conversions
*/
export const unsafeToNumber = n => Number(format(n));
/**
* Checks if a given `BigDecimal` is an integer.
*
* @example
* ```ts
* import * as assert from "node:assert"
* import { isInteger, unsafeFromString } from "effect/BigDecimal"
*
* assert.deepStrictEqual(isInteger(unsafeFromString("0")), true)
* assert.deepStrictEqual(isInteger(unsafeFromString("1")), true)
* assert.deepStrictEqual(isInteger(unsafeFromString("1.1")), false)
* ```
*
* @since 2.0.0
* @category predicates
*/
export const isInteger = n => normalize(n).scale <= 0;
/**
* Checks if a given `BigDecimal` is `0`.
*
* @example
* ```ts
* import * as assert from "node:assert"
* import { isZero, unsafeFromString } from "effect/BigDecimal"
*
* assert.deepStrictEqual(isZero(unsafeFromString("0")), true)
* assert.deepStrictEqual(isZero(unsafeFromString("1")), false)
* ```
*
* @since 2.0.0
* @category predicates
*/
export const isZero = n => n.value === bigint0;
/**
* Checks if a given `BigDecimal` is negative.
*
* @example
* ```ts
* import * as assert from "node:assert"
* import { isNegative, unsafeFromString } from "effect/BigDecimal"
*
* assert.deepStrictEqual(isNegative(unsafeFromString("-1")), true)
* assert.deepStrictEqual(isNegative(unsafeFromString("0")), false)
* assert.deepStrictEqual(isNegative(unsafeFromString("1")), false)
* ```
*
* @since 2.0.0
* @category predicates
*/
export const isNegative = n => n.value < bigint0;
/**
* Checks if a given `BigDecimal` is positive.
*
* @example
* ```ts
* import * as assert from "node:assert"
* import { isPositive, unsafeFromString } from "effect/BigDecimal"
*
* assert.deepStrictEqual(isPositive(unsafeFromString("-1")), false)
* assert.deepStrictEqual(isPositive(unsafeFromString("0")), false)
* assert.deepStrictEqual(isPositive(unsafeFromString("1")), true)
* ```
*
* @since 2.0.0
* @category predicates
*/
export const isPositive = n => n.value > bigint0;
const isBigDecimalArgs = args => isBigDecimal(args[0]);
/**
* Calculate the ceiling of a `BigDecimal` at the given scale.
*
* @example
* ```ts
* import * as assert from "node:assert"
* import { ceil, unsafeFromString } from "effect/BigDecimal"
*
* assert.deepStrictEqual(ceil(unsafeFromString("145"), -1), unsafeFromString("150"))
* assert.deepStrictEqual(ceil(unsafeFromString("-14.5")), unsafeFromString("-14"))
* ```
*
* @since 3.16.0
* @category math
*/
export const ceil = /*#__PURE__*/dual(isBigDecimalArgs, (self, scale = 0) => {
const truncated = truncate(self, scale);
if (isPositive(self) && lessThan(truncated, self)) {
return sum(truncated, make(1n, scale));
}
return truncated;
});
/**
* Calculate the floor of a `BigDecimal` at the given scale.
*
* @example
* ```ts
* import * as assert from "node:assert"
* import { floor, unsafeFromString } from "effect/BigDecimal"
*
* assert.deepStrictEqual(floor(unsafeFromString("145"), -1), unsafeFromString("140"))
* assert.deepStrictEqual(floor(unsafeFromString("-14.5")), unsafeFromString("-15"))
* ```
*
* @since 3.16.0
* @category math
*/
export const floor = /*#__PURE__*/dual(isBigDecimalArgs, (self, scale = 0) => {
const truncated = truncate(self, scale);
if (isNegative(self) && greaterThan(truncated, self)) {
return sum(truncated, make(-1n, scale));
}
return truncated;
});
/**
* Truncate a `BigDecimal` at the given scale. This is the same operation as rounding away from zero.
*
* @example
* ```ts
* import * as assert from "node:assert"
* import { truncate, unsafeFromString } from "effect/BigDecimal"
*
* assert.deepStrictEqual(truncate(unsafeFromString("145"), -1), unsafeFromString("140"))
* assert.deepStrictEqual(truncate(unsafeFromString("-14.5")), unsafeFromString("-14"))
* ```
*
* @since 3.16.0
* @category math
*/
export const truncate = /*#__PURE__*/dual(isBigDecimalArgs, (self, scale = 0) => {
if (self.scale <= scale) {
return self;
}
// BigInt division truncates towards zero
return make(self.value / 10n ** BigInt(self.scale - scale), scale);
});
/**
* Internal function used by `round` for `half-even` and `half-odd` rounding modes.
*
* Returns the digit at the position of the given `scale` within the `BigDecimal`.
*
* @internal
*/
export const digitAt = /*#__PURE__*/dual(2, (self, scale) => {
if (self.scale < scale) {
return 0n;
}
const scaled = self.value / 10n ** BigInt(self.scale - scale);
return scaled % 10n;
});
/**
* Rounds a `BigDecimal` at the given scale with the specified rounding mode.
*
* @example
* ```ts
* import * as assert from "node:assert"
* import { round, unsafeFromString } from "effect/BigDecimal"
*
* assert.deepStrictEqual(round(unsafeFromString("145"), { mode: "from-zero", scale: -1 }), unsafeFromString("150"))
* assert.deepStrictEqual(round(unsafeFromString("-14.5")), unsafeFromString("-15"))
* ```
*
* @since 3.16.0
* @category math
*/
export const round = /*#__PURE__*/dual(isBigDecimalArgs, (self, options) => {
const mode = options?.mode ?? "half-from-zero";
const scale = options?.scale ?? 0;
switch (mode) {
case "ceil":
return ceil(self, scale);
case "floor":
return floor(self, scale);
case "to-zero":
return truncate(self, scale);
case "from-zero":
return isPositive(self) ? ceil(self, scale) : floor(self, scale);
case "half-ceil":
return floor(sum(self, make(5n, scale + 1)), scale);
case "half-floor":
return ceil(sum(self, make(-5n, scale + 1)), scale);
case "half-to-zero":
return isNegative(self) ? floor(sum(self, make(5n, scale + 1)), scale) : ceil(sum(self, make(-5n, scale + 1)), scale);
case "half-from-zero":
return isNegative(self) ? ceil(sum(self, make(-5n, scale + 1)), scale) : floor(sum(self, make(5n, scale + 1)), scale);
}
const halfCeil = floor(sum(self, make(5n, scale + 1)), scale);
const halfFloor = ceil(sum(self, make(-5n, scale + 1)), scale);
const digit = digitAt(halfCeil, scale);
switch (mode) {
case "half-even":
return equals(halfCeil, halfFloor) ? halfCeil : digit % 2n === 0n ? halfCeil : halfFloor;
case "half-odd":
return equals(halfCeil, halfFloor) ? halfCeil : digit % 2n === 0n ? halfFloor : halfCeil;
}
});
/**
* Takes an `Iterable` of `BigDecimal`s and returns their sum as a single `BigDecimal`
*
* @example
* ```ts
* import * as assert from "node:assert"
* import { unsafeFromString, sumAll } from "effect/BigDecimal"
*
* assert.deepStrictEqual(sumAll([unsafeFromString("2"), unsafeFromString("3"), unsafeFromString("4")]), unsafeFromString("9"))
* ```
*
* @category math
* @since 3.16.0
*/
export const sumAll = collection => {
let out = zero;
for (const n of collection) {
out = sum(out, n);
}
return out;
};
//# sourceMappingURL=BigDecimal.js.map
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