47 lines
1.1 KiB
JavaScript
47 lines
1.1 KiB
JavaScript
var isObjectLike = require('./isObjectLike');
|
|
|
|
/** `Object#toString` result references. */
|
|
var numberTag = '[object Number]';
|
|
|
|
/** Used for built-in method references. */
|
|
var objectProto = Object.prototype;
|
|
|
|
/**
|
|
* Used to resolve the
|
|
* [`toStringTag`](http://ecma-international.org/ecma-262/7.0/#sec-object.prototype.tostring)
|
|
* of values.
|
|
*/
|
|
var objectToString = objectProto.toString;
|
|
|
|
/**
|
|
* Checks if `value` is classified as a `Number` primitive or object.
|
|
*
|
|
* **Note:** To exclude `Infinity`, `-Infinity`, and `NaN`, which are
|
|
* classified as numbers, use the `_.isFinite` method.
|
|
*
|
|
* @static
|
|
* @memberOf _
|
|
* @since 0.1.0
|
|
* @category Lang
|
|
* @param {*} value The value to check.
|
|
* @returns {boolean} Returns `true` if `value` is a number, else `false`.
|
|
* @example
|
|
*
|
|
* _.isNumber(3);
|
|
* // => true
|
|
*
|
|
* _.isNumber(Number.MIN_VALUE);
|
|
* // => true
|
|
*
|
|
* _.isNumber(Infinity);
|
|
* // => true
|
|
*
|
|
* _.isNumber('3');
|
|
* // => false
|
|
*/
|
|
function isNumber(value) {
|
|
return typeof value == 'number' ||
|
|
(isObjectLike(value) && objectToString.call(value) == numberTag);
|
|
}
|
|
|
|
module.exports = isNumber;
|