Question

Excuse me for not using any technical descriptions here as I am new to javascript. But this is a simple question for anyone learned in javascript.

I am just trying to create a new class that takes only one argument from an existing one that takes two or more arguments.

var newclass(arg) = oldclass(1,"hello",arg); // newclass is pre-filled with 1 and "hello"

Therefore I want to essentially pre-fill the arguments so I may only have to pass one argument in. What is the proper way of doing this in javascript?

Answer 1

JavaScript doesnt support default parameters. You can do something along the lines of:

function newClass(arg) {
  return oldClass(1, "hello", arg);
}

or:

function oldClass(arg1, arg2, arg3) {
  arg2 = typeof arg2 !== 'undefined' ? arg2 : "hello";
  arg3 = typeof arg3 !== 'undefined' ? arg3 : 1;
}