javascript : Merge two arrays into one

Question

Say for example I have an array

arr = [ 1, 2, 3 4, 5, 6 ]

Instead, I would like to use aliases for each line Ex.

var a = [ 1, 2, 3 ]; var b = [ 4, 5, 6 ];

Where

arr = [ a, b ]

should be the same as the original arr.

Yet the current example gives back [ [1,2,3],[4,5,6] ] instead

How would I achieve something like this in javascript?

Javascript is not a whitespace sensitive language, line breaks will not matter. — Tomanow
– Tomanow, Commented Feb 1, 2015 at 4:43
@thefourtheye arr = [a, b] results in [ [1,2,3],[4,5,6]] — dk123
– dk123, Commented Feb 1, 2015 at 4:45
@dk123 What exactly do you want? I couldn't understand that from the question. Can you please explain clearly with an example? — thefourtheye
– thefourtheye, Commented Feb 1, 2015 at 4:46
Please clarify "it isn't at the moment since I would be inserting arrays instead of actual numbers of lists" — ReallyMadeMeThink
– ReallyMadeMeThink, Commented Feb 1, 2015 at 4:48

bgoldst · Accepted Answer · 2015-02-01 04:47:51Z

Use Array::concat():

var a = [ 1, 2, 3 ]; var b = [ 4, 5, 6 ]; var c = [ 7, 8, 9 ]; var arr = Array.concat(a,b,c); alert(arr); // 1,2,3,4,5,6,7,8,9

http://jsfiddle.net/9ys2ow0y/1/

Vijay · Accepted Answer · 2015-02-01 05:42:02Z

"should be the same as the original arr." NO!!!

The concat() method is used to join two or more arrays.

This method does not change the existing arrays, but returns a new array, containing the values of the joined arrays.

var a = [ 1, 2, 3 ]; var b = [ 4, 5, 6 ]; arr = a.concat(b); //or Array.concat(a,b); console.log(a);//[1,2,3] console.log(b);//[4,5,6] console.log(arr);//[1,2,3,4,5,6]

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