I'm trying to understand the purpose of the [0] in the function call I came across and what value is returned to x?
x = my_function(var1, var2)[0];
function my_function(v1, v2){
var v3, v4
v3 = v1 * 3;
v4 = v2 * 7;
return( [v3, v4] );
}
They mean that the function returns an array and you only need the first element of that array.
return is not a function, by the way. You don't need the parenthesis.