How to get value in an object's key using a variable referencing that key?

Question

I have an object and I can reference key a as in the following:

var obj = {    a: "A",    b: "B",    c: "C" }  console.log(obj.a); // return string : A 

I want to get the value by using a variable to reference the object key as below:

var name = "a"; console.log(obj.name) // this prints undefined, but I want it to print "A" 

How can I do this?

Answer 1

Use [] notation for string representations of properties:

console.log(obj[name]); 

Otherwise it's looking for the "name" property, rather than the "a" property.

Answer 2

obj["a"] is equivalent to obj.a so use obj[name] you get "A"