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How to get a random item from a JavaScript array

var myArray = ['a','b','c'];
var randomItem = myArray[Math.floor(Math.random()*myArray.length)]

Math.random() returns a number between 0 (included) and 1 (not included), which is why this piece of code won’t overshoot by picking a number equal to the array length (reminder: array indexes start at 0, meaning last index is length – 1).

Math.round() is not appropriate as it would result in sometimes hitting a number equal to the array length. Hence the Math.floor().

Posted in JavaScript / TypeScript / Node.js.


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