How to convert arrays into an array of objects

Question

Hi I'm trying to make an array of objects from several arrays.This is probably a very basic question, but I didn't find a proper way of doing it from searching online. :(

The original data I've got is

valueYes = [15,30,22,18,2,6,38,18];
valueNo = [23,75,45,12,45,9,17,23];
valueNotSure = [1,-1,1,1,-1,-1,-1,1];

What I want to achieve is an array like :

data = [object1, object2,.....]

Each object is made of :

object1 = {valueYes:15, valueNo:23,valueNotSure:1}
object2 = {valueYes:30, valueNo:75,valueNotSure:-1}
.......

my current code is a bit messy, which only return me an empty value of each key:

valueYes = [15,30,22,18,2,6,38,18];
valueNo = [23,75,45,12,45,9,17,23];
valueNotSure = [1,-1,1,1,-1,-1,-1,1];

var object1 = Object.create({}, { 
    myChoice: { value: function(myChoice) {for  (var i = 0; i < len; i++){return this.myChoice[i] = myChoice[i];} } } 

});

xlecoustillier · Accepted Answer · 2014-12-08 13:45:29Z

6

Assuming all your arrays have the same size:

valueYes = [15,30,22,18,2,6,38,18];
valueNo = [23,75,45,12,45,9,17,23];
valueNotSure = [1,-1,1,1,-1,-1,-1,1];

var data = [];

for(var i = 0; i < valueYes.length; i++){
    data.push({
        valueYes: valueYes[i],
        valueNo: valueNo[i],
        valueNotSure: valueNotSure[i]
    });
}

edited Dec 8, 2014 at 13:45

answered Dec 8, 2014 at 13:27

xlecoustillier

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1 Comment

user2510699 Over a year ago

ah, this is the thing I'm looking for, very clear! thank you!

Matt · Accepted Answer · 2014-12-08 13:28:04Z

3

You could use something like below;

var objs = valueYes.map(function (v, i) {
    return {
        valueYes: v,
        valueNo: valueNo[i],
        valueNotSure: valueNotSure[i]
    };
});

... this uses the map() Array method, and assumes that all the arrays are the same length...

answered Dec 8, 2014 at 13:28

Matt

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2 Comments

T.J. Crowder Over a year ago

Yeah, I considered map, but thought the loop might be clearer, given the OP's level...

Christian Benseler Over a year ago

Nice & elegant solution with .map()

Christian Benseler · Accepted Answer · 2014-12-08 13:28:36Z

0

This?

var valueYes = [15,30,22,18,2,6,38,18];
var valueNo = [23,75,45,12,45,9,17,23];
var valueNotSure = [1,-1,1,1,-1,-1,-1,1];

var data = [];
valueYes.forEach(function(item, index) {
    data.push({ valueYes: valueYes[index], valueNo: valueNo[index], valueNotSure: valueNotSure[index] });
});

console.log(data);

http://jsfiddle.net/chrisbenseler/9t1y1zhk/

answered Dec 8, 2014 at 13:28

Christian Benseler

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2 Comments

user663031 Over a year ago

Why would you use forEach and push when map does exactly the same thing? And why would you use valueYes[index] when you already have it in item?

Christian Benseler Over a year ago

You need the index because you have to get the [index] of the other 2 arrays. The "item" references only values from the valueYes array. And I didn't thought about using .map(). I have also commented on Matt's post that use .map() is very elegant ;-)

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