133 lines
3.7 KiB
JavaScript
133 lines
3.7 KiB
JavaScript
/**
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* lodash 3.0.8 (Custom Build) <https://lodash.com/>
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* Build: `lodash modern modularize exports="npm" -o ./`
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* Copyright 2012-2015 The Dojo Foundation <http://dojofoundation.org/>
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* Based on Underscore.js 1.8.3 <http://underscorejs.org/LICENSE>
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* Copyright 2009-2015 Jeremy Ashkenas, DocumentCloud and Investigative Reporters & Editors
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* Available under MIT license <https://lodash.com/license>
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*/
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var isArguments = require('lodash.isarguments'),
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isArray = require('lodash.isarray');
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/** Used to detect unsigned integer values. */
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var reIsUint = /^\d+$/;
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/** Used for native method references. */
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var objectProto = Object.prototype;
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/** Used to check objects for own properties. */
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var hasOwnProperty = objectProto.hasOwnProperty;
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/**
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* Used as the [maximum length](https://people.mozilla.org/~jorendorff/es6-draft.html#sec-number.max_safe_integer)
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* of an array-like value.
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*/
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var MAX_SAFE_INTEGER = 9007199254740991;
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/**
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* Checks if `value` is a valid array-like index.
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*
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* @private
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* @param {*} value The value to check.
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* @param {number} [length=MAX_SAFE_INTEGER] The upper bounds of a valid index.
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* @returns {boolean} Returns `true` if `value` is a valid index, else `false`.
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*/
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function isIndex(value, length) {
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value = (typeof value == 'number' || reIsUint.test(value)) ? +value : -1;
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length = length == null ? MAX_SAFE_INTEGER : length;
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return value > -1 && value % 1 == 0 && value < length;
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}
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/**
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* Checks if `value` is a valid array-like length.
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*
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* **Note:** This function is based on [`ToLength`](https://people.mozilla.org/~jorendorff/es6-draft.html#sec-tolength).
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*
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* @private
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* @param {*} value The value to check.
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* @returns {boolean} Returns `true` if `value` is a valid length, else `false`.
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*/
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function isLength(value) {
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return typeof value == 'number' && value > -1 && value % 1 == 0 && value <= MAX_SAFE_INTEGER;
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}
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/**
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* Checks if `value` is the [language type](https://es5.github.io/#x8) of `Object`.
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* (e.g. arrays, functions, objects, regexes, `new Number(0)`, and `new String('')`)
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*
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* @static
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* @memberOf _
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* @category Lang
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* @param {*} value The value to check.
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* @returns {boolean} Returns `true` if `value` is an object, else `false`.
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* @example
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*
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* _.isObject({});
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* // => true
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*
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* _.isObject([1, 2, 3]);
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* // => true
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*
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* _.isObject(1);
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* // => false
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*/
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function isObject(value) {
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// Avoid a V8 JIT bug in Chrome 19-20.
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// See https://code.google.com/p/v8/issues/detail?id=2291 for more details.
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var type = typeof value;
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return !!value && (type == 'object' || type == 'function');
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}
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/**
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* Creates an array of the own and inherited enumerable property names of `object`.
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*
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* **Note:** Non-object values are coerced to objects.
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*
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* @static
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* @memberOf _
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* @category Object
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* @param {Object} object The object to query.
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* @returns {Array} Returns the array of property names.
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* @example
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*
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* function Foo() {
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* this.a = 1;
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* this.b = 2;
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* }
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*
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* Foo.prototype.c = 3;
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*
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* _.keysIn(new Foo);
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* // => ['a', 'b', 'c'] (iteration order is not guaranteed)
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*/
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function keysIn(object) {
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if (object == null) {
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return [];
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}
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if (!isObject(object)) {
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object = Object(object);
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}
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var length = object.length;
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length = (length && isLength(length) &&
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(isArray(object) || isArguments(object)) && length) || 0;
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var Ctor = object.constructor,
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index = -1,
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isProto = typeof Ctor == 'function' && Ctor.prototype === object,
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result = Array(length),
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skipIndexes = length > 0;
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while (++index < length) {
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result[index] = (index + '');
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}
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for (var key in object) {
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if (!(skipIndexes && isIndex(key, length)) &&
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!(key == 'constructor' && (isProto || !hasOwnProperty.call(object, key)))) {
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result.push(key);
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}
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}
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return result;
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}
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module.exports = keysIn;
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