default array values

Is there a way to assign a default values to arrays in javascript?

ex: an array with 24 slots that defaults to 0

You can use the fill function on an array:

Array(24).fill(0)

Note: fill was only introduced in ECMAScript 2015 (alias "6"), so as of 2017 browser support is still very limited (for example no Internet Explorer).

var a = Array.apply(null, Array(24)).map(function() { return 0 });

// or:
var a = Array.apply(null, Array(5)).map(Boolean).map(Number);

Array.prototype.repeat= function(what, L){
 while(L) this[--L]= what;
 return this;
}

var A= [].repeat(0, 24);

alert(A)

A little wordy, but it works.

var aray = [ 0, 0, 0, 0, 0, 0,
             0, 0, 0, 0, 0, 0,
             0, 0, 0, 0, 0, 0,
             0, 0, 0, 0, 0, 0 ];