How to add a variable to an array?

Question

JavaScript

Hello!
There is a line:

var meth = "action";
st(meth);
function st(meth){
 data.push({
                   'ecommerce': {
                       meth : { 'products': [product] }
                  }
            });
}

How to make the meth variable correctly added to the array? Now it is written simply meth, instead of action.

Answer 1

var value = {
  'ecommerce': {}
};
value.ecommerce[meth] = { 'products': [product] }
 data.push(value);

Answer 2

var meth = "action", data = [];
function st(meth){
    data.push({
        'ecommerce': {
            [meth]: { 'products': ["product"] }
        }
    });
}
st(meth);

But this syntax is not correct in old JS engines.