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Add replace to randchoice

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This commit is contained in:
Todd Parsons 2023-08-31 12:10:18 +01:00
parent cd8e06c6ff
commit c0cab86f3e
1 changed files with 18 additions and 3 deletions
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21
src/util/Util.js
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@ -431,22 +431,37 @@ export function shuffle(array, randomNumberGenerator = undefined)
* @param {Function} [randomNumberGenerator = undefined] - A function used to generated random numbers in the interal [0, 1). Defaults to Math.random
* @return {Object[]} a chosen value from the array
*/
export function randchoice(array, size = 1, randomNumberGenerator = undefined)
export function randchoice(array, size = 1, replace = true, randomNumberGenerator = undefined)
{
if (!Number.isInteger(size) | size < 1) {
// raise error if given an invalid size
throw {
origin: "util.random",
context: "when generating a random float",
context: "when choosing a random value from array",
error: "size must be a positive integer above 0",
};
}
if (!replace & size > array.length) {
// if replace is fase, then size can't exceed size of array as each value can only be used once
throw {
origin: "util.random",
context: "when choosing a random value from array",
error: "size cannot exceed length of array when replace is false",
};
}
if (size > 1) {
// if size > 1, call function multiple times with size = 1 and return an array
let values = []
let tempArray = array
for (let i = 0; i < size; i++) {
values.push(randchoice(array, 1, randomNumberGenerator));
// add value taken from copy of array
let val = randchoice(tempArray, 1, replace, randomNumberGenerator)
values.push(val)
// if replace is false, remove value from copy of array
if (!replace) {
tempArray.pop(val)
}
}
return values
}