async.js

/* CHALLENGE 1 */

function sayHowdy() {
  console.log('Howdy');
}

function testMe() {
  setTimeout(sayHowdy, 0);
  console.log('Partnah');
}
// After thinking it through, uncomment the following line to check your guess!
// testMe(); // what order should these log out? Howdy or Partnah first?


/* CHALLENGE 2 */

function delayedGreet() {
  setTimeout(() => {
    console.log("welcome")
  }, 3000)
}
// Uncomment the following line to check your work!
// delayedGreet(); // should log (after 3 seconds): welcome


/* CHALLENGE 3 */

function helloGoodbye() {
  console.log("hello");
  setTimeout(() => {
    console.log("goodbye")
  }, 2000)
}
// Uncomment the following line to check your work!
// helloGoodbye(); // should log: hello // should also log (after 3 seconds): good bye


/* CHALLENGE 4 */

function brokenRecord() {
  setInterval(() => {
    console.log("hi again")
  }, 1000)
}
// Uncomment the following line to check your work!
// brokenRecord(); // should log (every second): hi again


/* CHALLENGE 5 */

function limitedRepeat() {
  let count = 0;
  let id = setInterval(() => {
    console.log("hi for now");
    count++
    if(count >= 5) {
      clearInterval(id)
    }
  }, 1000)
}
// Uncomment the following line to check your work!
// limitedRepeat(); // should log (every second, for 5 seconds): hi for now


/* CHALLENGE 6 */

function everyXsecsForYsecs(func, interval, duration) {
  let currentDuration = 0;
  let id = setInterval(() => {
  	func()
    currentDuration += interval
    if(currentDuration >= duration) {
      clearInterval(id)
    }
  }, interval)
}
// Uncomment the following lines to check your work!
function theEnd() {
	console.log('This is the end!');
}
// everyXsecsForYsecs(theEnd, 2000, 20000); // should invoke theEnd function every 2 seconds, for 20 seconds): This is the end!


/* CHALLENGE 7 */

function delayCounter(target, wait) {
  let current = 1;
	return function(){
    let id = setInterval(() => {
      if(current <= target) {
        console.log(current)
        current++;
      } else {
        clearInterval(id)
      }
    }, wait)
  }
}

// UNCOMMENT THESE TO TEST YOUR WORK!
const countLogger = delayCounter(3, 1000)
// countLogger();
// After 1 second, log 1
// After 2 seconds, log 2
// After 3 seconds, log 3

/* CHALLENGE 8 */

function promised (val) {
  let promise = new Promise((resolve, reject) => {
    setTimeout(() => {
    	resolve(val)
    }, 2000)
  })
      
  return promise;
}

// UNCOMMENT THESE TO TEST YOUR WORK!
// const createPromise = promised('wait for it...');
// createPromise.then((val) => console.log(val)); 
// will log "wait for it..." to the console after 2 seconds

/* CHALLENGE 9 */

class SecondClock {
  constructor(cb) {
    this.cb = cb
    this.seconds = 0;
  }
  start() {
    this.id = setInterval( () => {
      this.cb(++this.seconds % 60)
    }, 1000)
  }
  
  reset() {
    this.seconds = 0
    clearInterval(this.id)
  }
}

// UNCOMMENT THESE TO TEST YOUR WORK!
/*
const clock = new SecondClock((val) => { console.log(val) });
console.log("Started Clock.");
clock.start();
setTimeout(() => {
	clock.reset();
  console.log("Stopped Clock after 6 seconds.");
}, 6000);
*/
/* CHALLENGE 10 */

function debounce(callback, interval) {
  let duration = 0
  let id
  return function(){
    if(duration <= 0) {
      duration = interval
      clearInterval(id)
    	id = setInterval(() => {duration -= 100}, 100)
      return callback()
    }
  }
}

// UNCOMMENT THESE TO TEST YOUR WORK!
/*
function giveHi() { return 'hi'; }
const giveHiSometimes = debounce(giveHi, 3000);
console.log(giveHiSometimes()); // -> 'hi'
setTimeout(function() { console.log(giveHiSometimes()); }, 2000); // -> undefined
setTimeout(function() { console.log(giveHiSometimes()); }, 4000); // -> 'hi'
setTimeout(function() { console.log(giveHiSometimes()); }, 8000); // -> 'hi'
*/