Pushing javascript object key value to javascript object key arrays

Question

I'm having a stupid issue, probably due to my syntax. How can I dynamically push all keys from object arr[j] into object arr[i]?

var arr = [{key:["data1","data2"]},{key:"data"}];
var i = 0;
var j = 1;
for(var key in arr[i]){
     arr[i][key].push(arr[j][key]);
     // arr[i][key] is an array, arr[j[key;] is a string
}

Rather than brutally typing everything out (which works for me):

arr[i][key1].push(arr[j].key1);
arr[i][key2].push(arr[j].key2);

Arr[i] will then contain its previous information and object 2 information in the form of an array. Basically, I'm concatenating JavaScript objects. In the end, arr[i] should look like:

key1:[arr[i].key1Value,arr[j].key1Value]
key2:[arr[i].key2Value,arr[j].key2Value]

Thanks in advance!!

Can you add the expected output to your question as it's not clear to me what you want to do. — Andy
– Andy, Commented Nov 18, 2015 at 11:59
@Andy put it in there. Basically I'm just concatenating JavaScript objects into an array. — zdebruine
– zdebruine, Commented Nov 18, 2015 at 12:02

Cerbrus · Accepted Answer · 2015-11-18 12:10:53Z

1

Relatively simple:

var arr = [{key:["data1","data2"]},{key:"data"}],
    i = 0,
    j = 1,
    target = arr[i],
    source = arr[j];

target.key.push(source.key);

If the source has multiple keys, try this instead:

var arr = [{key:["data1","data2"]},{key:"data", key1: "data1", key2: "data2"}],
    i = 0,
    j = 1,
    target = arr[i],
    source = arr[j];

for(var key in source){           // Loop over the keys in the source
    target.key.push(source[key]); // And add them to the target's `key` array.
}

Result:

[
    { key: ["data1", "data2", "data", "data1", "data2"]},
    { key: "data", key1: "data1", key2: "data2"}
]

edited Nov 18, 2015 at 12:10

answered Nov 18, 2015 at 12:01

Cerbrus

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2 Comments

zdebruine Over a year ago

Nice solution, this does it!

Cerbrus Over a year ago

So, this is the output you were looking for? I'm happy to be of help! Thanks for accepting the answer :-)

Avraam Mavridis · Accepted Answer · 2015-11-18 12:06:35Z

0

I am not 100% sure if I understand what you try to achieve but maybe this helps:

var arr = [{key:["data1","data2"]},{key:"data"}];
var target = [];

arr.forEach( function(value,index){
   target['key' + index] = value;

});

Output:

target.key0 : { key: [ 'data1' 'data2' ]}
target.key1 : { key: [ 'data' ]}

answered Nov 18, 2015 at 12:06

Avraam Mavridis

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