Name in the index of an array

Question

I need to create an array or object, but with dynamic name/index, like this of the example, but the name must come from a variable:

var1 = "testeIndex";

var obj = {
    var1 : {
        'elemento1' : 'dado1',
        'elemento2' : 'dado2'
    },
    var2 : {
        'elemento1' : 'dado1',
        'elemento2' : 'dado2'
    },
    var3 : {
        'elemento1' : 'dado1',
        'elemento2' : 'dado2'
    },
};

However, when I put the variable name, even without quotation marks, the index takes the literal name of the variable.

It’s possible to do what I’m trying to do?

Answer 1

Try with

var obj = {
    [var1] : {
        // ...
    }
}

Reference:
https://stackoverflow.com/questions/6500573/dynamic-keys-for-object-literals-in-javascript

According to the link, this notation is supported as of Ecmascript 2015. In previous versions it is necessary to construct the step-by-step object, with:

obj = {};
obj[var1] = { /*...*/ };
// etc.

See also:
Browser compatibility: (is the Computed Property Names line)