compare.js•1.08 kB
"use strict";
var strCompare = require("../string/#/case-insensitive-compare")
, isObject = require("./is-object")
, isValue = require("./is-value")
, numIsNaN = require("../number/is-nan")
, resolve
, typeMap;
typeMap = { undefined: 0, object: 1, boolean: 2, string: 3, number: 4 };
resolve = function (a) {
if (isObject(a)) {
if (typeof a.valueOf !== "function") return NaN;
a = a.valueOf();
if (isObject(a)) {
if (typeof a.toString !== "function") return NaN;
a = a.toString();
if (typeof a !== "string") return NaN;
}
}
return a;
};
module.exports = function (val1, val2) {
if (val1 === val2) return 0; // Same
val1 = resolve(val1);
val2 = resolve(val2);
// eslint-disable-next-line eqeqeq
if (val1 == val2) return typeMap[typeof val1] - typeMap[typeof val2];
if (!isValue(val1)) return -1;
if (!isValue(val2)) return 1;
if (typeof val1 === "string" || typeof val2 === "string") {
return strCompare.call(val1, val2);
}
if (numIsNaN(val1) && numIsNaN(val2)) return 0; // Jslint: ignore
return Number(val1) - Number(val2);
};