Use javascript function parameter to get value from object

Question

I have the following code:

var myObj = {apples:"five", pears:"two"};

function myFunction(x) {
    alert(myObj.x);
};

When I run myFunction(apples) I don't get an alert saying five, but I get an alert saying undefined.

How do I get the result I want by using the function parameter x with the object myObj

The result I want is it to say 'five' instead of 'undefined'.

Superdrac · Accepted Answer · 2015-10-03 18:05:14Z

2

For getting a property with a string, you need to use brackets myObj["name"]

Correct code:

var myObj = {apples:"five", pears:"two"};

function myFunction(x) {
    alert(myObj[x]);
};

answered Oct 3, 2015 at 18:05

Superdrac

1,20817 silver badges29 bronze badges

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

Comments

Pal R · Accepted Answer · 2015-10-03 18:05:39Z

2

Use [] notation:

var myObj = {apples:"five", pears:"two"};

function myFunction(x) {
    alert(myObj[x]);
};

myFunction('apples')

answered Oct 3, 2015 at 18:05

Pal R

5344 silver badges11 bronze badges

DRD · Accepted Answer · 2015-10-03 18:06:21Z

1

You have to pass the property name as a string. And within a function use bracket notation ([]) for access instead of using a dot (.).

var myObj = {apples:"five", pears:"two"};

function myFunction(x) {
    alert(myObj[x]);
};

myFunction("apples");

answered Oct 3, 2015 at 18:06

DRD

5,84118 silver badges16 bronze badges