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| import toFinite from './toFinite.js' | |
| /** Built-in method references without a dependency on `root`. */ | |
| const freeParseFloat = parseFloat | |
| /** | |
| * Produces a random number between the inclusive `lower` and `upper` bounds. | |
| * If only one argument is provided a number between `0` and the given number | |
| * is returned. If `floating` is `true`, or either `lower` or `upper` are | |
| * floats, a floating-point number is returned instead of an integer. | |
| * | |
| * **Note:** JavaScript follows the IEEE-754 standard for resolving | |
| * floating-point values which can produce unexpected results. | |
| * | |
| * @since 0.7.0 | |
| * @category Number | |
| * @param {number} [lower=0] The lower bound. | |
| * @param {number} [upper=1] The upper bound. | |
| * @param {boolean} [floating] Specify returning a floating-point number. | |
| * @returns {number} Returns the random number. | |
| * @see uniqueId | |
| * @example | |
| * | |
| * random(0, 5) | |
| * // => an integer between 0 and 5 | |
| * | |
| * random(5) | |
| * // => also an integer between 0 and 5 | |
| * | |
| * random(5, true) | |
| * // => a floating-point number between 0 and 5 | |
| * | |
| * random(1.2, 5.2) | |
| * // => a floating-point number between 1.2 and 5.2 | |
| */ | |
| function random(lower, upper, floating) { | |
| if (floating === undefined) { | |
| if (typeof upper === 'boolean') { | |
| floating = upper | |
| upper = undefined | |
| } | |
| else if (typeof lower === 'boolean') { | |
| floating = lower | |
| lower = undefined | |
| } | |
| } | |
| if (lower === undefined && upper === undefined) { | |
| lower = 0 | |
| upper = 1 | |
| } | |
| else { | |
| lower = toFinite(lower) | |
| if (upper === undefined) { | |
| upper = lower | |
| lower = 0 | |
| } else { | |
| upper = toFinite(upper) | |
| } | |
| } | |
| if (lower > upper) { | |
| const temp = lower | |
| lower = upper | |
| upper = temp | |
| } | |
| if (floating || lower % 1 || upper % 1) { | |
| const rand = Math.random() | |
| const randLength = `${rand}`.length - 1 | |
| return Math.min(lower + (rand * (upper - lower + freeParseFloat(`1e-${randLength}`))), upper) | |
| } | |
| return lower + Math.floor(Math.random() * (upper - lower + 1)) | |
| } | |
| export default random |