83 lines
2.3 KiB
JavaScript
83 lines
2.3 KiB
JavaScript
var baseRandom = require('./_baseRandom'),
|
|
isIterateeCall = require('./_isIterateeCall'),
|
|
toFinite = require('./toFinite');
|
|
|
|
/** Built-in method references without a dependency on `root`. */
|
|
var freeParseFloat = parseFloat;
|
|
|
|
/* Built-in method references for those with the same name as other `lodash` methods. */
|
|
var nativeMin = Math.min,
|
|
nativeRandom = Math.random;
|
|
|
|
/**
|
|
* 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.
|
|
*
|
|
* @static
|
|
* @memberOf _
|
|
* @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.
|
|
* @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 && typeof floating != 'boolean' && isIterateeCall(lower, upper, floating)) {
|
|
upper = floating = undefined;
|
|
}
|
|
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) {
|
|
var temp = lower;
|
|
lower = upper;
|
|
upper = temp;
|
|
}
|
|
if (floating || lower % 1 || upper % 1) {
|
|
var rand = nativeRandom();
|
|
return nativeMin(lower + (rand * (upper - lower + freeParseFloat('1e-' + ((rand + '').length - 1)))), upper);
|
|
}
|
|
return baseRandom(lower, upper);
|
|
}
|
|
|
|
module.exports = random;
|