How to loop through an array of arrays using jQuery or JavaScript?

Question

I have a json array like this

var data = key: [
    {
        arr1: [
            {value: 1},
            {value: 2},
            {value: 3},
        ]
    },
    {
        arr2: [
            {value: 1},
            {value: 2},
            {value: 3},
        ]
    },
    {
        arr3: [
            {value: 1},
            {value: 2},
            {value: 3},
        ]
    }
]

I wanted to loop through key which is 3 times, and inside the key loop I wanted loop again through each of the elements inside key.

First I tried $.each which works fine for key array. And inside the each function I tried to get the key values using Object.key(this) inside the loop which returned me the names

arr1, arr2, arr3

But I'm not able to loop through the names I got.

$.each(data, function(i, e) {
    Object.keys(this).each(function(index, element) {
        console.log(element);
    })    
})

I don't know if this is the right way of doing it, when I tried doing it this was. I got an error telling .each is not a function.

Any help will be much appreciated.

because an array does not have an each method.... Arrays have forEach... — epascarello
– epascarello, Commented Nov 14, 2017 at 17:44
Something like this works for you? stackoverflow.com/questions/7106410/… — Fede Antuña
– Fede Antuña, Commented Nov 14, 2017 at 17:44
If you realy like jQuery, try use $(Object.keys(this)).each( ... ). — Arnial
– Arnial, Commented Nov 14, 2017 at 17:44
What is that stray key: there in the first line? The code defining your object is not valid JavaScript. — JLRishe
– JLRishe, Commented Nov 14, 2017 at 17:48

JLRishe · Accepted Answer · 2017-11-14 17:47:17Z

The simple way to do this would be to use three loops, but trying to make that work with this taking on a new meaning in each loop would be unnecessarily complicated.

I recommend using .forEach and giving a clear name to each loop variable:

var data =  [
    {
        arr1: [
            {value: 1},
            {value: 2},
            {value: 3},
        ]
    },
    {
        arr2: [
            {value: 1},
            {value: 2},
            {value: 3},
        ]
    },
    {
        arr3: [
            {value: 1},
            {value: 2},
            {value: 3},
        ]
    }
]

data.forEach(function (outerObj) {
  Object.keys(outerObj).forEach(function (key) {
    outerObj[key].forEach(function (item) {
      console.log(item);
    });
  });
});

Of course, there may be a better solution if you would actually tell us what you wanted to accomplish with these loops.

trincot · Accepted Answer · 2017-11-14 17:52:16Z

4

If you want to keep with the jQuery pattern, then just keep using each for each nested level:

var data = [{arr1: [{value: 1}, {value: 2}, {value: 3}]}, {arr2: [{value: 1}, {value: 2}, {value: 3}]}, {arr3: [{value: 1}, {value: 2}, {value: 3}]}];

$.each(data, function(i, e) {
    $.each(e, function(key, arr) {
        console.log(key);
        $.each(arr, function(index, obj) {
            console.log("...", index, obj.value);
        });
    });
})

.as-console-wrapper { max-height: 100% !important; top: 0; }

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>

answered Nov 14, 2017 at 17:52

trincot

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1 Comment

Unknown User Over a year ago

When I tried passing the e to $.each it wasn't working. So I switched to this.each which didn't work as well. But in your answer it works. +1

Shiladitya · Accepted Answer · 2017-11-15 03:17:38Z

3

I believe the reason your attempt is not working is because you are trying to .each the individual values themselves, rather than the arrays within data.

This should work:

$.each(data, function(index, array) { // This each iterates over the arrays.
  $.each(array, function(subindex, value) { // This each iterates over the individual values.
    console.log(value); // Logs the individual values.
  });
});

edited Nov 15, 2017 at 3:17

Shiladitya

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answered Nov 14, 2017 at 17:54

Payden K. Pringle

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