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utils.js
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utils.js
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/**
* Returns a random integer between the specified values
* @param {Int, Int} min, max
* @return {Int}
*/
function getRandomInt(min, max) {
min = Math.ceil(min);
max = Math.floor(max);
return Math.floor(Math.random() * (max - min)) + min;
}
/**
* Swaps two values in an array.
* @param {Array} arr - array containing the items.
* @param {int} x, y - index of first and second item to swap.
* @return {void}
*/
function swap(arr, x, y) {
var temp = arr[x];
arr[x] = arr[y];
arr[y] = temp;
}
/**
* Reverses an array.
* @param {Array} arr - array to reverse.
* @param {int} i, j - index to begin and end range.
* @return {void}
*/
function reverse(arr, i, j) {
while (i < j) {
swap(arr, i, j);
i++;
j--;
}
}
function isPrime(value) {
for (var i = 2; i < value; i++) {
if (value % i === 0) {
return false;
}
}
return value > 1;
}
module.exports = {
getRandomInt,
swap,
reverse
}