Is it possible to create dynamic keys in a object in javascript?

Question

for example I ask the user to enter an input and he enters "key" and I save the value on a variable called INPUT. Then I want to create an object with this like this.

var obj = {INPUT: "some other input"}; where INPUT = key

I know I can add more values but I need to know the key ahead of time in order to add it. Can I add a new key without knowing what it is?

Answer 1

Yes, with computed property names. Assuming INPUT is an actual variable, simply wrap it in [].

var obj = {[INPUT]: "some other input"};

The long version of doing this would be to use bracket notation when adding your keys.

var obj = {};
obj[INPUT] = "some other input";