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var baseGetTag = require('./_baseGetTag'), | |
getPrototype = require('./_getPrototype'), | |
isObjectLike = require('./isObjectLike'); | |
/** `Object#toString` result references. */ | |
var objectTag = '[object Object]'; | |
/** Used for built-in method references. */ | |
var funcProto = Function.prototype, | |
objectProto = Object.prototype; | |
/** Used to resolve the decompiled source of functions. */ | |
var funcToString = funcProto.toString; | |
/** Used to check objects for own properties. */ | |
var hasOwnProperty = objectProto.hasOwnProperty; | |
/** Used to infer the `Object` constructor. */ | |
var objectCtorString = funcToString.call(Object); | |
/** | |
* Checks if `value` is a plain object, that is, an object created by the | |
* `Object` constructor or one with a `[[Prototype]]` of `null`. | |
* | |
* @static | |
* @memberOf _ | |
* @since 0.8.0 | |
* @category Lang | |
* @param {*} value The value to check. | |
* @returns {boolean} Returns `true` if `value` is a plain object, else `false`. | |
* @example | |
* | |
* function Foo() { | |
* this.a = 1; | |
* } | |
* | |
* _.isPlainObject(new Foo); | |
* // => false | |
* | |
* _.isPlainObject([1, 2, 3]); | |
* // => false | |
* | |
* _.isPlainObject({ 'x': 0, 'y': 0 }); | |
* // => true | |
* | |
* _.isPlainObject(Object.create(null)); | |
* // => true | |
*/ | |
function isPlainObject(value) { | |
if (!isObjectLike(value) || baseGetTag(value) != objectTag) { | |
return false; | |
} | |
var proto = getPrototype(value); | |
if (proto === null) { | |
return true; | |
} | |
var Ctor = hasOwnProperty.call(proto, 'constructor') && proto.constructor; | |
return typeof Ctor == 'function' && Ctor instanceof Ctor && | |
funcToString.call(Ctor) == objectCtorString; | |
} | |
module.exports = isPlainObject; | |