Bahmutov - Essence of functional programming

essence-of-functional-programming.js

//----------------first
// function timedPrint(character, N, interval) {
//   var counter = 0;
//   var intervalId = setInterval(function () {
//     console.log(character);
//     counter += 1;
//     if (counter >= N) {
//       clearInterval(intervalId);
//       console.log('done printing', character, N, 'times');
//     }
//   }, interval);
// }

// timedPrint('a', 3, 1000);


//----------------second
// const printA = console.log.bind(console, 'a');

// const timedPrint = (workload, N, interval) => {
//   let counter = 0;
//   const intervalId = setInterval(function(){
//     workload();
//     counter++;
//     if(counter === N){
//       console.log('printing is done');
//       clearInterval(intervalId);
//     }
//   }, interval);
// }

// timedPrint(printA, 3, 1000);

//----------------third
const printCharacter = (c) => console.log(c);
const countToN = (n) => {
  let start = 0;
  return () =>{
    start++;
    return start === n;
  };
};

const timedPrint = (workload, isDone, interval) => {
 
  const intervalId = setInterval(function(){
    workload();
    if(isDone()){
      console.log('printing is done');
      clearInterval(intervalId);
    }
  }, interval);
}

timedPrint(printCharacter('a'), countToN(3), 1000);