I have this code sample:
var a = 'foo';
var b = {a:'2'};
b.foo //undefined
What I want is that b.foo exists and returns "2" in this example, but when creating the variable "b" the variable "a" ceases to exist when called inside the object what happens is that the name of the property becomes "a" ... how do I make the property name be the value of an existing variable?
If I understand you, you want to create the attribute on the object b which is in the value of a . So you can do it like this:
var a = 'foo';
var b = {};
b[a] = '2';
document.getElementById('saida').innerHTML = 'b.foo = ' + b.foo;<p id='saida'></p>More details on this response: link
ES6 introduces computerized property names, which allow you to do:
var a = 'foo';
var b = {[a]: 2};
console.log(b);Reference: Developer Mozilla - Object initializer