_equals.js•2.59 kB
var _arrayFromIterator = require('./_arrayFromIterator');
var _functionName = require('./_functionName');
var _has = require('./_has');
var identical = require('../identical');
var keys = require('../keys');
var type = require('../type');
module.exports = function _equals(a, b, stackA, stackB) {
if (identical(a, b)) {
return true;
}
if (type(a) !== type(b)) {
return false;
}
if (a == null || b == null) {
return false;
}
if (typeof a.equals === 'function' || typeof b.equals === 'function') {
return typeof a.equals === 'function' && a.equals(b) &&
typeof b.equals === 'function' && b.equals(a);
}
switch (type(a)) {
case 'Arguments':
case 'Array':
case 'Object':
if (typeof a.constructor === 'function' &&
_functionName(a.constructor) === 'Promise') {
return a === b;
}
break;
case 'Boolean':
case 'Number':
case 'String':
if (!(typeof a === typeof b && identical(a.valueOf(), b.valueOf()))) {
return false;
}
break;
case 'Date':
if (!identical(a.valueOf(), b.valueOf())) {
return false;
}
break;
case 'Error':
return a.name === b.name && a.message === b.message;
case 'RegExp':
if (!(a.source === b.source &&
a.global === b.global &&
a.ignoreCase === b.ignoreCase &&
a.multiline === b.multiline &&
a.sticky === b.sticky &&
a.unicode === b.unicode)) {
return false;
}
break;
case 'Map':
case 'Set':
if (!_equals(_arrayFromIterator(a.entries()), _arrayFromIterator(b.entries()), stackA, stackB)) {
return false;
}
break;
case 'Int8Array':
case 'Uint8Array':
case 'Uint8ClampedArray':
case 'Int16Array':
case 'Uint16Array':
case 'Int32Array':
case 'Uint32Array':
case 'Float32Array':
case 'Float64Array':
break;
case 'ArrayBuffer':
break;
default:
// Values of other types are only equal if identical.
return false;
}
var keysA = keys(a);
if (keysA.length !== keys(b).length) {
return false;
}
var idx = stackA.length - 1;
while (idx >= 0) {
if (stackA[idx] === a) {
return stackB[idx] === b;
}
idx -= 1;
}
stackA.push(a);
stackB.push(b);
idx = keysA.length - 1;
while (idx >= 0) {
var key = keysA[idx];
if (!(_has(key, b) && _equals(b[key], a[key], stackA, stackB))) {
return false;
}
idx -= 1;
}
stackA.pop();
stackB.pop();
return true;
};