Object containing array in javascript

Question

I want to construct an object, where one of the property is going to be an array:

var a = 1;
var b = ["a","b"]
var b1 = ["c","d"]
var c = {}

I want the object c to be like this:

{"prop":1, prop1: ["ac","bd"]}

I tried doing it like this:

c.prop = a;
for (var index = 0 ; index < b.length; index++){
    c.prop1[index] = b[index] + b1[index];
}

I just edited the question. I want to do processing. So I want to add element one by one. Not directly like c.prop1 = b — Prachi g
– Prachi g, Commented Jan 19, 2015 at 5:25
What's the value of c.prop1 before your for loop? If c.prop1 isn't defined yet, you can't set properties on it with c.prop1[index] = ..., and you'll see errors in your JavaScript console to that effect. — Jordan Running
– Jordan Running, Commented Jan 19, 2015 at 5:27

andrusieczko · Accepted Answer · 2015-01-19 08:27:17Z

2

You can initialize the property prop1 in your object as an empty array [] and then add the proper objects to it using push method. The code:

var a = 1;
var b = ["a","b"]
var b1 = ["c","d"]
var c = {}
c.prop = a;
c.prop1 = []; // initialization
for (var index = 0 ; index < b.length; index++){
    c.prop1.push(b[index] + b1[index]); // pushing computed values
}

edited Jan 19, 2015 at 8:27

answered Jan 19, 2015 at 5:29

andrusieczko

2,82414 silver badges23 bronze badges

Sign up to request clarification or add additional context in comments.

1 Comment

jfriend00 Over a year ago

Answers with an explanation (more than just code) that explain why or what was changed are generally better than answers that are just code. You could improve this answer by explaining.

jasonscript · Accepted Answer · 2015-01-19 05:30:00Z

1

I think you need to define your array prop1 first, before you can start adding values to it;

c.prop = a;
c.prop1 = [];       // declare prop1 to be an empty array
for (var index = 0 ; index < b.length; index++){
    c.prop1[index] = b[index] + b1[index];
}

answered Jan 19, 2015 at 5:30

jasonscript

6,2063 gold badges30 silver badges46 bronze badges

Comments

Ancient · Accepted Answer · 2015-01-19 05:32:13Z

1

var associativeArray = {};
associativeArray["one"] = [];
associativeArray["two"] = [];
associativeArray["three"] = [];

If you are coming from OO Language then you should have a look at this

answered Jan 19, 2015 at 5:32

Ancient

3,07714 gold badges59 silver badges105 bronze badges

1 Comment

Prachi g Over a year ago

Thanks for that link Ancient.

Collectives™ on Stack Overflow

Object containing array in javascript

3 Answers 3

1 Comment

Comments

1 Comment

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

3 Answers 3

1 Comment

Comments

1 Comment

Your Answer

Sign up or log in

Post as a guest

Related