mirror of
https://github.com/whoisclebs/lodash.git
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122 lines
3.1 KiB
JavaScript
122 lines
3.1 KiB
JavaScript
/**
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* lodash 4.0.2 (Custom Build) <https://lodash.com/>
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* Build: `lodash modularize exports="npm" -o ./`
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* Copyright 2012-2016 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 2009-2016 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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/** `Object#toString` result references. */
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var objectTag = '[object Object]';
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/**
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* Checks if `value` is a host object in IE < 9.
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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 host object, else `false`.
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*/
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function isHostObject(value) {
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// Many host objects are `Object` objects that can coerce to strings
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// despite having improperly defined `toString` methods.
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var result = false;
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if (value != null && typeof value.toString != 'function') {
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try {
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result = !!(value + '');
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} catch (e) {}
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}
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return result;
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}
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/** Used for built-in method references. */
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var objectProto = Object.prototype;
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/** Used to resolve the decompiled source of functions. */
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var funcToString = Function.prototype.toString;
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/** Used to infer the `Object` constructor. */
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var objectCtorString = funcToString.call(Object);
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/**
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* Used to resolve the [`toStringTag`](http://ecma-international.org/ecma-262/6.0/#sec-object.prototype.tostring)
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* of values.
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*/
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var objectToString = objectProto.toString;
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/** Built-in value references. */
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var getPrototypeOf = Object.getPrototypeOf;
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/**
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* Checks if `value` is object-like. A value is object-like if it's not `null`
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* and has a `typeof` result of "object".
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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 object-like, else `false`.
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* @example
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*
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* _.isObjectLike({});
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* // => true
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*
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* _.isObjectLike([1, 2, 3]);
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* // => true
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*
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* _.isObjectLike(_.noop);
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* // => false
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*
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* _.isObjectLike(null);
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* // => false
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*/
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function isObjectLike(value) {
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return !!value && typeof value == 'object';
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}
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/**
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* Checks if `value` is a plain object, that is, an object created by the
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* `Object` constructor or one with a `[[Prototype]]` of `null`.
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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 a plain object, else `false`.
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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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* }
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*
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* _.isPlainObject(new Foo);
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* // => false
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*
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* _.isPlainObject([1, 2, 3]);
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* // => false
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*
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* _.isPlainObject({ 'x': 0, 'y': 0 });
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* // => true
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*
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* _.isPlainObject(Object.create(null));
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* // => true
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*/
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function isPlainObject(value) {
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if (!isObjectLike(value) ||
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objectToString.call(value) != objectTag || isHostObject(value)) {
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return false;
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}
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var proto = objectProto;
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if (typeof value.constructor == 'function') {
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proto = getPrototypeOf(value);
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}
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if (proto === null) {
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return true;
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}
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var Ctor = proto.constructor;
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return (typeof Ctor == 'function' &&
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Ctor instanceof Ctor && funcToString.call(Ctor) == objectCtorString);
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}
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module.exports = isPlainObject;
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