Create an array with random values
The shortest approach (ES6)
// randomly generated N = 40 length array 0 <= A[N] <= 39Array.from({length: 40}, () => Math.floor(Math.random() * 40));Enjoy!
Here's a solution that shuffles a list of unique numbers (no repeats, ever).
for (var a=[],i=0;i<40;++i) a[i]=i;// http://stackoverflow.com/questions/962802#962890function shuffle(array) { var tmp, current, top = array.length; if(top) while(--top) { current = Math.floor(Math.random() * (top + 1)); tmp = array[current]; array[current] = array[top]; array[top] = tmp; } return array;}a = shuffle(a);If you want to allow repeated values (which is not what the OP wanted) then look elsewhere. :)
ES5:
function randomArray(length, max) { return Array.apply(null, Array(length)).map(function() { return Math.round(Math.random() * max); });}ES6:
randomArray = (length, max) => [...new Array(length)] .map(() => Math.round(Math.random() * max));