ds-algo-study/DS-n-Algos/Arrays/basic-examples/problems/13-hidden-counter.js

Just experimenting with publishing a package

/***********************************************************************
Write a function named `hiddenCounter()`. This function will do two things - first
it will define a count variable, then it will return a function. 
When invoked the function returned by hiddenCounter will increment the counter by 1.

Look below to see how this function is invoked:

let hidden1 = hiddenCounter(); //returns a function
hidden1(); // returns 1
hidden1(); // returns 2

let hidden2 = hiddenCounter(); // returns a function
hidden2(); // returns 1


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

function hiddenCounter() {
  let count = 0;
  return () => (count += 1);
}


module.exports = hiddenCounter;