ds-algo-study/DS-n-Algos/Arrays/basic-examples/problems/19-lazy-adder.js

Just experimenting with publishing a package

/***********************************************************************
Write a function named: lazyAdder(firstNum). The lazyAdder function will
accept a number and return a function. When the function returned by lazyAdder
is invoked it will again accept a number, (secondNum), and then return a function.
When the last mentioned function is invoked with a number, (thirdNum), it will
FINALLY return a number. See below for examples!

Example 1:
let firstAdd = lazyAdder(1);
let secondAdd = firstAdd(2);
let sum = secondAdd(3);
console.log(sum); // prints 6

Example 2:
let func1 = lazyAdder(10);
let func2 = func1(20);
let total = func2(3);
console.log(total); // prints 33

***********************************************************************/

function lazyAdder(firstNum) {
  return function (secondNum) {
    return function (thirdNum) {
      return firstNum + secondNum + thirdNum;
    };
  };
}


module.exports = lazyAdder;