ts-prime/dist/es/equals.js

A utility library for JavaScript and Typescript.

import { purry } from './purry';
// from https://github.com/epoberezkin/fast-deep-equal/blob/master/index.js
var isArray = Array.isArray;
var keyList = Object.keys;
var hasProp = Object.prototype.hasOwnProperty;
export function equals() {
    return purry(_equals, arguments);
}
function _equals(a, b) {
    if (a === b) {
        return true;
    }
    if (a && b && typeof a === 'object' && typeof b === 'object') {
        var arrA = isArray(a);
        var arrB = isArray(b);
        var i = void 0;
        var length = void 0;
        var key = void 0;
        if (arrA && arrB) {
            length = a.length;
            if (length !== b.length) {
                return false;
            }
            for (i = length; i-- !== 0;) {
                if (!equals(a[i], b[i])) {
                    return false;
                }
            }
            return true;
        }
        if (arrA !== arrB) {
            return false;
        }
        var dateA = a instanceof Date;
        var dateB = b instanceof Date;
        if (dateA !== dateB) {
            return false;
        }
        if (dateA && dateB) {
            return a.getTime() === b.getTime();
        }
        var regexpA = a instanceof RegExp;
        var regexpB = b instanceof RegExp;
        if (regexpA !== regexpB) {
            return false;
        }
        if (regexpA && regexpB) {
            return a.toString() === b.toString();
        }
        var keys = keyList(a);
        length = keys.length;
        if (length !== keyList(b).length) {
            return false;
        }
        for (i = length; i-- !== 0;) {
            if (!hasProp.call(b, keys[i])) {
                return false;
            }
        }
        for (i = length; i-- !== 0;) {
            key = keys[i];
            if (!equals(a[key], b[key])) {
                return false;
            }
        }
        return true;
    }
    return a !== a && b !== b;
}