Question

I want to merge a argument of a function with a variable
But i don’t know how to do that.

firstDates = [];

function myFunction(partOne) {
    partOne + Dates.push(someOtherVar); 
}

myFunction(first);

I know that this not works, but what would be the right way?

Answer 1

why not something like this?

var dates = {};

function myFunction(partOne) {
   dates[partOne] = [];               // dates["first"] = []
   dates[partOne].push(someOtherVar); // dates["first"].push(someOtherVar)
}

myFunction("first");

Otherwise what you are trying to accomplish is an eval type of set up. This is generally a very bad idea. Don’t use dynamically named variables.