mirror of
https://github.com/whoisclebs/lodash.git
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118 lines
2.8 KiB
JavaScript
118 lines
2.8 KiB
JavaScript
/**
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* lodash (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 numberTag = '[object Number]';
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/** Used for built-in method references. */
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var objectProto = Object.prototype;
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/**
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* Used to resolve the
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* [`toStringTag`](http://ecma-international.org/ecma-262/7.0/#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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/**
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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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* @since 4.0.0
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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 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 `NaN`.
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*
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* **Note:** This method is based on
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* [`Number.isNaN`](https://mdn.io/Number/isNaN) and is not the same as
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* global [`isNaN`](https://mdn.io/isNaN) which returns `true` for
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* `undefined` and other non-number values.
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*
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* @static
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* @memberOf _
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* @since 0.1.0
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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 `NaN`, else `false`.
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* @example
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*
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* _.isNaN(NaN);
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* // => true
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*
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* _.isNaN(new Number(NaN));
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* // => true
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*
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* isNaN(undefined);
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* // => true
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*
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* _.isNaN(undefined);
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* // => false
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*/
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function isNaN(value) {
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// An `NaN` primitive is the only value that is not equal to itself.
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// Perform the `toStringTag` check first to avoid errors with some
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// ActiveX objects in IE.
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return isNumber(value) && value != +value;
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}
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/**
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* Checks if `value` is classified as a `Number` primitive or object.
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*
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* **Note:** To exclude `Infinity`, `-Infinity`, and `NaN`, which are
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* classified as numbers, use the `_.isFinite` method.
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*
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* @static
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* @memberOf _
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* @since 0.1.0
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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 number, else `false`.
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* @example
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*
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* _.isNumber(3);
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* // => true
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*
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* _.isNumber(Number.MIN_VALUE);
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* // => true
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*
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* _.isNumber(Infinity);
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* // => true
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*
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* _.isNumber('3');
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* // => false
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*/
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function isNumber(value) {
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return typeof value == 'number' ||
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(isObjectLike(value) && objectToString.call(value) == numberTag);
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}
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module.exports = isNaN;
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