Last change
on this file since fa375fe was 6a3a178, checked in by Ema <ema_spirova@…>, 3 years ago |
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[6a3a178] | 1 | var baseGetTag = require('./_baseGetTag'),
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| 2 | isObjectLike = require('./isObjectLike');
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| 3 |
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| 4 | /** `Object#toString` result references. */
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| 5 | var numberTag = '[object Number]';
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| 6 |
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| 7 | /**
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| 8 | * Checks if `value` is classified as a `Number` primitive or object.
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| 9 | *
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| 10 | * **Note:** To exclude `Infinity`, `-Infinity`, and `NaN`, which are
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| 11 | * classified as numbers, use the `_.isFinite` method.
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| 12 | *
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| 13 | * @static
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| 14 | * @memberOf _
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| 15 | * @since 0.1.0
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| 16 | * @category Lang
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| 17 | * @param {*} value The value to check.
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| 18 | * @returns {boolean} Returns `true` if `value` is a number, else `false`.
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| 19 | * @example
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| 20 | *
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| 21 | * _.isNumber(3);
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| 22 | * // => true
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| 23 | *
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| 24 | * _.isNumber(Number.MIN_VALUE);
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| 25 | * // => true
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| 26 | *
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| 27 | * _.isNumber(Infinity);
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| 28 | * // => true
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| 29 | *
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| 30 | * _.isNumber('3');
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| 31 | * // => false
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| 32 | */
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| 33 | function isNumber(value) {
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| 34 | return typeof value == 'number' ||
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| 35 | (isObjectLike(value) && baseGetTag(value) == numberTag);
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| 36 | }
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| 37 |
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| 38 | module.exports = isNumber;
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