71 lines
1.9 KiB
JavaScript
71 lines
1.9 KiB
JavaScript
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var baseRandom = require('../internal/baseRandom'),
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isIterateeCall = require('../internal/isIterateeCall');
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/* Native method references for those with the same name as other `lodash` methods. */
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var nativeMin = Math.min,
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nativeRandom = Math.random;
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/**
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* Produces a random number between `min` and `max` (inclusive). If only one
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* argument is provided a number between `0` and the given number is returned.
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* If `floating` is `true`, or either `min` or `max` are floats, a floating-point
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* number is returned instead of an integer.
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*
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* @static
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* @memberOf _
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* @category Number
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* @param {number} [min=0] The minimum possible value.
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* @param {number} [max=1] The maximum possible value.
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* @param {boolean} [floating] Specify returning a floating-point number.
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* @returns {number} Returns the random number.
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* @example
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*
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* _.random(0, 5);
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* // => an integer between 0 and 5
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*
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* _.random(5);
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* // => also an integer between 0 and 5
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*
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* _.random(5, true);
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* // => a floating-point number between 0 and 5
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*
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* _.random(1.2, 5.2);
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* // => a floating-point number between 1.2 and 5.2
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*/
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function random(min, max, floating) {
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if (floating && isIterateeCall(min, max, floating)) {
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max = floating = undefined;
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}
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var noMin = min == null,
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noMax = max == null;
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if (floating == null) {
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if (noMax && typeof min == 'boolean') {
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floating = min;
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min = 1;
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}
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else if (typeof max == 'boolean') {
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floating = max;
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noMax = true;
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}
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}
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if (noMin && noMax) {
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max = 1;
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noMax = false;
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}
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min = +min || 0;
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if (noMax) {
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max = min;
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min = 0;
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} else {
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max = +max || 0;
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}
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if (floating || min % 1 || max % 1) {
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var rand = nativeRandom();
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return nativeMin(min + (rand * (max - min + parseFloat('1e-' + ((rand + '').length - 1)))), max);
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}
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return baseRandom(min, max);
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}
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module.exports = random;
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