Combining 2 arrays in javascript

Question

I have 2 arrays in javascript.

            var A = ['c++', 'java', 'c', 'c#', ...];
            var B = [12, 3, 4, 25, ...];

Now from these 2 arrays i want to create another array like :

  [['c++',12], ['java',3], ['c',4], ['c#', 25] ...];

Both A and B arrays are variable length in my case so how can i do this?

It is a good idea to put your code that you have tried so far. — gentrobot
– gentrobot, Commented Jul 11, 2012 at 10:11
Are those your actual arrays? You might want to add commas between the elements! — James Allardice
– James Allardice, Commented Jul 11, 2012 at 10:12

Otto Allmendinger · Accepted Answer · 2012-07-11 10:11:35Z

3

Underscore.js is good at that:

_.zip(*arrays)

Merges together the values of each of the arrays with the values at the corresponding position. Useful when you have separate data sources that are coordinated through matching array indexes. If you're working with a matrix of nested arrays, zip.apply can transpose the matrix in a similar fashion.
_.zip(['moe', 'larry', 'curly'], [30, 40, 50], [true, false, false]);
=> [["moe", 30, true], ["larry", 40, false], ["curly", 50, false]]

answered Jul 11, 2012 at 10:11

Otto Allmendinger

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Florent · Accepted Answer · 2012-07-11 10:13:43Z

3

You can use this snippet if you don't to use any third party library:

var i = 0
  , n = A.length
  , C = [];

for (; i < n; i++) {
    C.push([A[i], B[i]]);
}

answered Jul 11, 2012 at 10:13

Florent

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amd · Accepted Answer · 2012-07-11 10:15:02Z

1

function Merge(A,B){
    var length = Math.min(A.length,B.length);
    var result = [];
    for(var i=0;i<length;i++){
     result.push([ A[i], B[i] ]) 
    }

    return result;
}

answered Jul 11, 2012 at 10:15

amd

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jjordan · Accepted Answer · 2012-07-11 10:18:16Z

0

I think that using a hashMap instead of 2 arrays could be a good solution for you.

In example, you could do something like the following:

var h = new Object(); // or just {}
h['c++'] = 12;
h['java'] = 3;
h['c'] = 4;

Take a look at:

http://www.mojavelinux.com/articles/javascript_hashes.html

answered Jul 11, 2012 at 10:18

jjordan

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