how to do a "flat push" in javascript?

Question

I want to push all individual elements of a source array onto a target array,

target.push(source); 

puts just source's reference on the target list.

In stead I want to do:

for (i = 0; i < source.length; i++) {     target.push(source[i]); } 

Is there a way in javascript to do this more elegant, without explicitly coding a repetition loop?

And while I'm at it, what is the correct term? I don't think that "flat push" is correct. Googling did not yield any results as source and target are both arrays.

Answer 1

You could use the concat method:

var num1 = [1, 2, 3];   var num2 = [4, 5, 6];   var num3 = [7, 8, 9];    // creates array [1, 2, 3, 4, 5, 6, 7, 8, 9]; num1, num2, num3 are unchanged   var nums = num1.concat(num2, num3); 

Answer 2

apply does what you want:

var target = [1,2]; var source = [3,4,5];  target.push.apply(target, source);  alert(target); // 1, 2, 3, 4, 5 

MDC - apply

Calls a function with a given this value and arguments provided as an array.