Initializing an Array with a Single Value

Question

Is there a more compact way to do this sort of initialization?

for (var i = 0; i < arraySize; i++) array[i] = value;

Answer 1

while(arraySize--) array.push(value);

no initialization (that i know of)

Answer 2

Not Javascript-specific, but in a few languages you can go for (item in array) item=value;

Answer 3

If you need to do it many times, you can always write a function:

function makeArray(howMany, value){
    var output = [];
    while(howMany--){
        output.push(value);
    }
    return output;
}

var data = makeArray(40, "Foo");

And, just for completeness (fiddling with the prototype of built-in objects is often not a good idea):

Array.prototype.fill = function(howMany, value){
    while(howMany--){
        this.push(value);
    }
}

So you can now:

var data = [];
data.fill(40, "Foo");

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Update: I've just seen your note about arraySize being a constant or literal. If so, just replace all while(howMany--) with good old for(var i=0; i<howMany; i++).