how to append string to json value

Question

Assuming I have a json variable inside a javascript file,

{
 A : "a",
 B : "b",
 C : "c"
}

now, I have a javascript variable and append the value to the value of the json variable. Somethinhg like this

{
 A : "a" + var1,
 B : "b" + var2 ,
 C : "c" + var3
}

is it possible??

Answer 1

Something like below:

var obj = { A : "a", B : "b", C : "c" };
obj.A += var1;
obj.B += var2;
obj.C += var3;

Answer 2

Use Object.keys and forEach :

var obj = {
        A: "a",
        B: "b",
        C: "c"
    },
    vars = [var1, var2, var3];

Object.keys(obj).forEach(function (key, i) {
    obj[key] += vars[i];
});

DEMO