insert data into array

Question

I can't insert data into array. I want it as one array. I want to add 12 months in each row. Below is my code:

var data = {};
for (var i = 0; i < 5; i++) {
    data[i] = {
        Name: "Sample",
        Group: "Sample",
        Offering: "India",
        Type: "Employee",
        subject: "Sample",
        sponser: true
    };

    for (j = 1; j <= 12; j++) {
        var val = "m" + j;
        data.val = j + 1;
    }
}

@AmrElgarhy that alone will not work, because val is a string and so actually you try to set the property val instead of m1, m2, ... — eisbehr
– eisbehr, Commented Aug 31, 2016 at 11:24
Take a look at my answer. I've posted everything very detailed there, with a porking example too. ;) — eisbehr
– eisbehr, Commented Aug 31, 2016 at 11:41

eisbehr · Accepted Answer · 2016-08-31 11:45:02Z

Your array is an object! If you want it to be an array, you need to change var data = {}; to var data = [];. But it will work the same way, so it makes no difference here.
You didn't declared the variable j in your second for loop. You need to add var in front of it, like you did in your first loop.
You need to specify the current index of your object / array you want to set the months to. So write data[i] instead of data in your second for loop.
As you want to use the value of val as key in your object / array, you need to put bracers [] around it. Otherwise you will only set the property val of the object.
Your months goes from 1 to 12. You will only need to set j instead of j + 1, because you otherwise write the months from 2 to 13.

var data = {};                       // this is an object
                                     // if it should be an array write 'var data = [];'

for( var i = 0; i < 5; i++ ) {
    data[i] = {
        Name     : "Sample",
        Group    : "Sample",
        Offering : "India",
        Type     : "Employee",
        subject  : "Sample",
        sponser  : true
    };

    for( var j = 1; j <= 12; j++ ) { // added 'var' before 'j'
        var val = "m" + j;
        data[i][val] = j;            // added '[i]' after 'data'
                                     // changed '.val' to '[val]'
                                     // removed '+ 1' after 'j'
    }
}

console.log(data);

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