ballclock.js

class ballClock {
  constructor() {
    this.Min = [];
    this.FiveMin = [];
    this.Hour = [];
    this.Main = [];
  }
 
  modeOneCycleLength(numberOfBalls) {
    let available = new Array(numberOfBalls).fill(0).map((n, i) => i + 1);
    let mins = Number.POSITIVE_INFINITY;
    // initialize the ramps (queues)
    let rampOne = [];
    let rampTwo = [];
    let rampThree = [];
    // every minute that passes add one ball from the queue to the top ramp (rampOne)
    // every fifth minute add to the second ramp (rampTwo)
    // and every hour (60 minutes) add to the third ramp (rampThree)
    for (let i = 1; i <= mins; i++) {
      if (i % 5 === 0) {
        rampTwo.push(available.pop());
        available = rampOne.concat(available);
        rampOne.length = 0;
 
        if (rampTwo.length === 12) {
          rampThree.push(rampTwo.pop());
          available = rampTwo.concat(available);
          rampTwo.length = 0;
        }
        if (rampThree.length === 12) {
          let value = rampThree.pop();
          available = [value].concat(rampThree).concat(available);
          rampThree.length = 0;
          if (available.length === numberOfBalls) {
            // only need to check for cycle if all balls are returned to pool
            let count = 0;
            for (let j = 0; j < available.length; j++) {
              if (j === available[j] - 1) {
                count++;
              }
            }
            // check if every value at each index is what it was initialized with
            // if true, we have completed a cycle
            if (count === available.length) {
              return 'Cycle length:', i / 60 / 24;
            }
          }
        }
      } else {
        rampOne.push(available.pop());
      }
    }
  }
 
  modeTwoCurrentState(numberOfBalls, mins) {
    let available = new Array(numberOfBalls).fill(0).map((n, i) => i + 1);
 
    let rampOne = [];
    let rampTwo = [];
    let rampThree = [];
 
    // iterations will stop once minutes value (passed in) is reached
    for (let i = 1; i <= mins; i++) {
      if (i % 5 === 0) {
        rampTwo.push(available.pop());
        available = rampOne.concat(available);
        rampOne.length = 0;
 
        if (rampTwo.length === 12) {
          rampThree.push(rampTwo.pop());
          available = rampTwo.concat(available);
          rampTwo.length = 0;
        }
        if (rampThree.length === 12) {
          let value = rampThree.pop();
          available = [value].concat(rampThree).concat(available);
          rampThree.length = 0;
        }
      } else {
        rampOne.push(available.pop());
      }
    }
    //state is recorded
    this.Min = rampOne;
    this.FiveMin = rampTwo;
    this.Hour = rampThree;
    this.Main = available;
    return JSON.stringify(this);
  }
}