root / HServer / 00.Server / 00.Program / node_modules / lodash / random.js
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| 1 | 39 | HKM | var baseRandom = require('./_baseRandom'), |
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| 2 | isIterateeCall = require('./_isIterateeCall'),
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| 3 | toFinite = require('./toFinite');
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| 4 | |||
| 5 | /** Built-in method references without a dependency on `root`. */
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| 6 | var freeParseFloat = parseFloat;
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| 7 | |||
| 8 | /* Built-in method references for those with the same name as other `lodash` methods. */
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| 9 | var nativeMin = Math.min,
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| 10 | nativeRandom = Math.random; |
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| 11 | |||
| 12 | /**
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| 13 | * Produces a random number between the inclusive `lower` and `upper` bounds.
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| 14 | * If only one argument is provided a number between `0` and the given number
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| 15 | * is returned. If `floating` is `true`, or either `lower` or `upper` are
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| 16 | * floats, a floating-point number is returned instead of an integer.
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| 17 | *
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| 18 | * **Note:** JavaScript follows the IEEE-754 standard for resolving
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| 19 | * floating-point values which can produce unexpected results.
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| 20 | *
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| 21 | * @static
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| 22 | * @memberOf _
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| 23 | * @since 0.7.0
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| 24 | * @category Number
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| 25 | * @param {number} [lower=0] The lower bound.
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| 26 | * @param {number} [upper=1] The upper bound.
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| 27 | * @param {boolean} [floating] Specify returning a floating-point number.
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| 28 | * @returns {number} Returns the random number.
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| 29 | * @example
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| 30 | *
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| 31 | * _.random(0, 5);
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| 32 | * // => an integer between 0 and 5
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| 33 | *
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| 34 | * _.random(5);
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| 35 | * // => also an integer between 0 and 5
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| 36 | *
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| 37 | * _.random(5, true);
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| 38 | * // => a floating-point number between 0 and 5
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| 39 | *
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| 40 | * _.random(1.2, 5.2);
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| 41 | * // => a floating-point number between 1.2 and 5.2
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| 42 | */
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| 43 | function random(lower, upper, floating) { |
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| 44 | if (floating && typeof floating != 'boolean' && isIterateeCall(lower, upper, floating)) { |
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| 45 | upper = floating = undefined;
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| 46 | } |
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| 47 | if (floating === undefined) { |
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| 48 | if (typeof upper == 'boolean') { |
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| 49 | floating = upper; |
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| 50 | upper = undefined;
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| 51 | } |
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| 52 | else if (typeof lower == 'boolean') { |
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| 53 | floating = lower; |
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| 54 | lower = undefined;
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| 55 | } |
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| 56 | } |
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| 57 | if (lower === undefined && upper === undefined) { |
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| 58 | lower = 0;
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| 59 | upper = 1;
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| 60 | } |
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| 61 | else {
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| 62 | lower = toFinite(lower); |
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| 63 | if (upper === undefined) { |
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| 64 | upper = lower; |
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| 65 | lower = 0;
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| 66 | } else {
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| 67 | upper = toFinite(upper); |
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| 68 | } |
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| 69 | } |
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| 70 | if (lower > upper) {
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| 71 | var temp = lower;
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| 72 | lower = upper; |
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| 73 | upper = temp; |
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| 74 | } |
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| 75 | if (floating || lower % 1 || upper % 1) { |
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| 76 | var rand = nativeRandom();
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| 77 | return nativeMin(lower + (rand * (upper - lower + freeParseFloat('1e-' + ((rand + '').length - 1)))), upper); |
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| 78 | } |
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| 79 | return baseRandom(lower, upper);
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| 80 | } |
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| 81 | |||
| 82 | module.exports = random; |