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carmour24/getRandomElements.js

Last active August 29, 2015 14:07
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Function to get a specified number of random elements from an array, optionally filtering using a filter function.
Raw
getRandomElements.js
function(elementArray, requiredCount, filter) {
var randomElements = [];
while (randomElements.length < requiredCount) {
var randomIndex = Math.floor(Math.random() * elementArray.length);
// If no filter function has been provided or the filter function returns true
// then add the element to the random array.
var element = elementArray[randomIndex];
if (!filter || (filter && filter(element, randomIndex, elementArray, randomElements))) {
randomElements.push(element);
}
}
return randomElements;
}
Raw
useGetRandomElements.js
var elements = [1, 2, 3, 4, 5];
var twoRandomElements = getRandomElements(elements, 2);
var twoRandomElementsFiltered(elements, 2, function (element) { return element != 4; });
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