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63 lines
1.6 KiB
JavaScript
63 lines
1.6 KiB
JavaScript
6 years ago
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var baseGetTag = require('./_baseGetTag'),
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getPrototype = require('./_getPrototype'),
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isObjectLike = require('./isObjectLike');
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/** `Object#toString` result references. */
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var objectTag = '[object Object]';
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/** Used for built-in method references. */
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var funcProto = Function.prototype,
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objectProto = Object.prototype;
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/** Used to resolve the decompiled source of functions. */
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var funcToString = funcProto.toString;
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/** Used to check objects for own properties. */
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var hasOwnProperty = objectProto.hasOwnProperty;
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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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* 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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* @since 0.8.0
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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) || baseGetTag(value) != objectTag) {
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return false;
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}
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var proto = getPrototype(value);
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if (proto === null) {
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return true;
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}
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var Ctor = hasOwnProperty.call(proto, 'constructor') && proto.constructor;
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return typeof Ctor == 'function' && Ctor instanceof Ctor &&
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funcToString.call(Ctor) == objectCtorString;
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}
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module.exports = isPlainObject;
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