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JavaScript MCQs

Select the following function that shuffles an array?

function 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; }

function shuffle(array) { return array.sort(function(a,b) { return (a-b); }); }

function shuffle(array) { for (var tmp, cur, top=array.length; top--;){ cur = (Math.random() * (top + 1)) << 0; tmp = array[cur]; array[cur] = array[top]; array[top] = tmp; } return array.sort(); }

Answer

Correct Answer: function 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; }

Explanation:

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