How to combine object array values into 1 array?

Question

I have a data object with each object containing a tags array, I would like to loop through the object and grab each of the object tags and combine eventually combine the values into 1 array called selections on completion of the loop. At the moment however I'm unable to solve this, I have tried pushing the tags into an array then use the underscore _.union method and also tries concatenating each looped array into 1 but with no success. Can anyone recommend a solution?

Fiddle: http://jsfiddle.net/24qh7zfv/3/

JS

var selection = [];

var data = ([
    {
        role: "Developer",
        tag: "developer",
        tags: ["Javascript", "CSS", "HTML"] 
    }, {
        role: "Producer",
        tag: "producer",
        tags: ["Project Management", "Pitching", "Billing"] 
    }
]);


for( var i = 0, len = data.length; i < len; i++ ) {
    selection.concat(data[i].tags);
}

console.log(selection);

KooiInc · Accepted Answer · 2014-10-10 14:40:35Z

2

You need to reassign selection, and concat to tho that. so use:

for( var i = 0, len = data.length; i < len; i++ ) {
    selection = selection.concat(data[i].tags);
}

answered Oct 10, 2014 at 14:40

KooiInc

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Comments

Tyler McGinnis · Accepted Answer · 2014-10-10 14:41:07Z

1

This should work.

var selection = [];

var data = [
    {
        role: "Developer",
        tag: "developer",
        tags: ["Javascript", "CSS", "HTML"] 
    }, {
        role: "Producer",
        tag: "producer",
        tags: ["Project Management", "Pitching", "Billing"] 
    }
];


for( var i = 0; i < data.length; i++ ) {
    for(var j = 0; j < data[i].tags.length; j++){
      selection.push(data[i].tags[j]);
    }
}

answered Oct 10, 2014 at 14:41

Tyler McGinnis

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Comments

Amit Joki · Accepted Answer · 2014-10-10 14:40:45Z

0

You can simply do this.

var selection = data.map(function(x){
   return x.tags;
}).join().split(",");

answered Oct 10, 2014 at 14:40

Amit Joki

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Comments

Anupbiswas Kumaran · Accepted Answer · 2014-10-10 15:14:24Z

0

i think better use concat array function . see concat function in http://skillgun.com/javascript/arrays/tutorial

answered Oct 10, 2014 at 15:14

Anupbiswas Kumaran

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