Adding variable to a array in javascript

Question

I am trying to add parameters to a function in javascript, but it doesnt work somehow.

Can you let me know, how can I add them ?

I have a function like :

var foo = function () {
        var a = {
            "abc":"value1"
            "bcd":"value2"
        }
        return a;
    };

Now, I do this :

alert(data: [foo()]) // Actually I keep it in my function and **it works**

And I can see "abcd" and "bcd" with values.

But, Now I want to add a more variable (which is dynamic), how can I do that

I try this :

data:[foo() + {"cde":"value3"}] //doesnt work
data:[foo().push ({"cde"="value3"})] //doesnt work

How can I add a more variable to this array

Even if you are creating a C# application, if your question isn't related to C#, there's no benefit to tagging it. — Jonesopolis
– Jonesopolis, Commented Nov 14, 2016 at 20:20

Christos · Accepted Answer · 2016-11-14 20:25:55Z

4

The foo is a function that returns an object not an array. So there isn't any push method. If you want to add a new property to the object that foo returns you can do so as below:

// keep a reference to the object that foo returns
var obj = foo();
obj["cde"] = "value3";

or using dot notation as

obj.cde = "value3";

var foo = function () {
    var a = {
        "abc":"value1",
        "bcd":"value2"
    }
    return a;
};

var obj = foo();
obj["cde"] = "value3";

console.log(obj);

edited Nov 14, 2016 at 20:25

answered Nov 14, 2016 at 20:20

Christos

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Comments

gmoniava · Accepted Answer · 2016-11-14 20:24:27Z

1

Why not try as below:

var x = foo();
x["newProp"] = 33;

edited Nov 14, 2016 at 20:24

answered Nov 14, 2016 at 20:21

gmoniava

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2 Comments

musicnothing Over a year ago

Any reason they couldn't do x.newProp = 33?

gmoniava Over a year ago

@musicnothing Yes, that's also possible.

guest271314 · Accepted Answer · 2016-11-14 20:34:30Z

You can use rest parameter, spread element Object.assign() to return a if no parameters passed, else set passed parameters to a object

var foo = function foo(...props) {
  var a = {
    "abc": "value1",
    "bcd": "value2"
  }
  // if no parameters passed return `a`
  if (!props.length) return a;
  // else set passed property at `a` object
  return Object.assign(a, ...props);
};

var a = foo();
var b = foo({"cde":"value3"});
console.log(a, b);

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