Insert datas from a JavaScript array to another one

Question

I have defined two JavaScript variables that are arrays into an array like:

var myMondaysImpressionsData = new Array(['2013-01-21', 2015], ['2013-01-28', 2967], ['2013-02-04', 2419], ['2013-02-11', 1311], ['2013-02-18', 1398], ['2013-02-25', 86161], ['2013-03-04', 216865], ['2013-03-11', 105252], ['2013-03-18', 141978], ['2013-03-25', 4647], ['2013-04-01', 46339], ['2013-04-08', 19920]);

and:

var myMondaysImpressionsPaidData = new Array([0], [0], [0], [0], [0], [69428], [186482], [74850], [107281], [0], [32781], [0]);

It's kinda mandatory to use this form because is for further scopes. My issue is that I want to take the values found in the second array and add them like that for example:

var example = new Array(['2013-01-21', 2015, 0], ['2013-01-28', 2967, 0], ['2013-02-04', 2419, 0], ['2013-02-11', 1311, 0], ['2013-02-18', 1398, 0], ['2013-02-25', 86161, 69428], ['2013-03-04', 216865, 186482], ['2013-03-11', 105252, 74850], ['2013-03-18', 141978, 107281], ['2013-03-25', 4647, 0], ['2013-04-01', 46339, 32781], ['2013-04-08', 19920, 0]);

in the first array. Like I said, I have to reach the form shown above in the example variable. How is this possible in JavaScript? What method should be used in this case of scenarios?

3 revs, 2 users 74% · Accepted Answer · 2013-04-18 16:43:05Z

3

Use a simple loop:

for (var i = 0; i < myMondaysImpressionsData.length; i++) {
    if (i < myMondaysImpressionsPaidData.length) {
        myMondaysImpressionsData[i].push(myMondaysImpressionsPaidData[0]);
    }
}

If you want to get a new array, that is not change the first one, simply copy it before. In JavaScript, this is done using

var copy = array.slice();

edited Apr 18, 2013 at 16:43

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3 revs, 2 users 74%
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2 Comments

David Hoerster Over a year ago

Does the OP want a new array, or the myMondaysImpressionsData array modified?

Daniela costina Vaduva Over a year ago

I would like to modify the array, not to create a new one if is possible :)

VisioN · Accepted Answer · 2013-04-18 16:25:04Z

0

One possible solution for modern browsers:

var example = myMondaysImpressionsData.slice().map(function(e, i) {
    return e.concat(myMondaysImpressionsPaidData[i]);
});

If you need old browsers support use shim for map() method from MDN.

answered Apr 18, 2013 at 16:25

VisioN

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Comments

Jacob T. Nielsen · Accepted Answer · 2013-04-18 16:52:25Z

0

Using the concat function of Array and assuming you would like to create a new object containing the final result I would solve it like this.

var example = [], length = myMondaysImpressionsPaidData.length, i;
for (i = 0; i < length; i++) {
    example.push(myMondaysImpressionsData[i].concat(myMondaysImpressionsPaidData[i]));
}

answered Apr 18, 2013 at 16:52

Jacob T. Nielsen

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