How to join two arrays into one two-dimensional array?

Question

I have two arrays. How can I join them into one multidimensional array?

The first array is:

var arrayA = ['Jhon, kend, 12, 62626262662', 
              'Lisa, Ann, 43, 672536452', 
              'Sophie, Lynn, 23, 636366363'];

My other array has the values:

var arrayB = ['Jhon', 'Lisa', 'Sophie'];

How could I get an array with this format??

var jarray = [['Jhon', ['Jhon, kend, 12, 62626262662']], 
              ['Lisa', ['Lisa, Ann, 43, 672536452']], 
              ['Sohphie', ['Sophie, Lynn, 23, 636366363']]]

This is called "zipping", here's the [javascript implementation](http://stackoverflow.com/a/10284006/989121). — georg, Feb 11 '13 at 21:23

Bergi · Accepted Answer · 2013-02-11T21:27:39.987

5

var jarray = [];
for (var i=0; i<arrayA.length && i<arrayB.length; i++)
    jarray[i] = [arrayB[i], [arrayA[i]]];

However, I wouldn't call that "multidimensional array" - that usually refers to arrays that include items of the same type. Also I'm not sure why you want the second part of your arrays be an one-element array.

edited Feb 11 '13 at 21:27

answered Feb 11 '13 at 21:22

Bergi

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Though you'd want to make sure the arrays are of equal length (or use the length of the smaller one). – Reinstate Monica -- notmaynard Feb 11 '13 at 21:23
1

@iamnotmaynard: I already use the length of the smaller one. Of course, a `for (var i=0, l=Math.min(arrayA.length, arrayB.length); i – Bergi Feb 11 '13 at 21:25
Ah, I see I had interchanged them. Fixed now. – Bergi Feb 11 '13 at 21:28
@FelixKling: You think the OP actually had more than 3 strings in his `arrayA`? Yes, then you would need to adapt my solution a bit. – Bergi Feb 12 '13 at 13:44
Oh damn... I'm so sorry, I did not notice that those are three strings. I thought the array contains 12 elements! So sorry :-/ Will delete all my comments. – Felix Kling Feb 12 '13 at 14:00

mplungjan · Answer 2 · 2022-03-26T07:25:48.150

Here is a map version

const arrayA = ['Jhon, kend, 12, 62626262662', 
              'Lisa, Ann, 43, 672536452', 
              'Sophie, Lynn, 23, 636366363'];

const arrayB = ['Jhon', 'Lisa', 'Sophie']; 

/*  expected output
    var jarray = [['Jhon', ['Jhon, kend, 12, 62626262662']], 
                 ['Lisa', ['Lisa, Ann, 43, 672536452']], 
                 ['Sohphie', ['Sophie, Lynn, 23, 636366363']]] */
              
 const jarray = arrayB.map((item,i) => [item,[arrayA[i]]]); 

 console.log(jarray);

score 0 · Answer 3 · edited Feb 11 '13 at 21:23

0

You can use Underscore.js http://underscorejs.org/#find Looks through each value in the list, returning the first one that passes a truth test (iterator). The function returns as soon as it finds an acceptable element, and doesn't traverse the entire list.

var even = _.find([1, 2, 3, 4, 5, 6], function(num){ return num % 2 == 0; });
=> 2

Then, you can make the same with the array B elements and by code, make a join.

edited Feb 11 '13 at 21:23

gen_Eric

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answered Feb 11 '13 at 21:19

Benjamin RD

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Hmm, really no. Because, he need find elements in the arrays A and B. And if he make a for (var i=0; i – Benjamin RD Feb 11 '13 at 21:22

score 0 · Answer 4 · answered Feb 11 '13 at 22:00

This is what I did to get what you were asking:

var jarray = [];
for (var i = 0; i < arrayB.length; i++) {
    jarray[i] = [];
    jarray[i].push(arrayB[i]);
    var valuesList = [],
        comparator = new RegExp(arrayB[i]);
    for (var e = 0; e < arrayA.length; e++) {       
        if (comparator.test(arrayA[e])) {
            valuesList.push(arrayA[e]);
       }        
    }
    jarray[i].push(valuesList);
}

How to join two arrays into one two-dimensional array?

4 Answers4