How to avoid multiple variable re-declarations on function outputs in JavaScript

Question

Consider the following example

function doSomethingToAVariable(variable){
    return variable + 1
}

function doSomethingToAVariableASecondTime(variable){
    re         


        

Answer 1

If it's as simple as adding some things together how about a recursive method. A bit like using promises but without actually using them.

function add(x) {
  return {
    done: () => x,
    add: (y) => add(x + y)
  }
}

let myVariable = 0;
add(myVariable).add(1).add(2).add(3).done(); // 6

DEMO