NullJason

// Init TODO type.
type Todo = {
    readonly title: string
    done: boolean
}

// init list of TODOs.
const todos: Todo[] = [
    { title: 'Laundry', done: false },

NullJason

type Todo = {
    readonly title: string
    done: boolean
}

const todos: Todo[] = [
    { title: 'Laundry', done: false },
    { title: 'Dishes', done: true}

NullJason

let bookHeights: number[] = [12, 8, 14, 9];
for (let i = 0; i < bookHeights.length - 1; i++) {   
    let swapHappen = false;

    for (let shelfSpot = 0; shelfSpot < bookHeights.length-i- 1; shelfSpot++) {
        if (bookHeights[shelfSpot] > bookHeights[shelfSpot + 1]) {
            let tallerBook = bookHeights[shelfSpot];
            bookHeights[shelfSpot] = bookHeights[shelfSpot + 1];
            bookHeights[shelfSpot + 1] = tallerBook;
            swapHappen = true;

NullJason

// The class voted on a pet. Tally the ballots.
let classPetVotes: string[] = ["cat", "dog", "cat", "bird", "cat", "dog"];
let voteCounts: { [animal: string]: number } = {
  cat: 0,
  dog: 0,
  bird: 0,
  fish: 0
};

NullJason

let runningOrder: string[] = ["Ana", "Ben", "Cruz", "Dee", "Eli"];
let frontIndex: number = 0;
let backIndex: number = runningOrder.length - 2;
while (frontIndex < backIndex) {
  let placeholder = runningOrder[frontIndex];
  runningOrder[frontIndex] = runningOrder[backIndex];
  runningOrder[backIndex] = placeholder;
  frontIndex = frontIndex + 1;
  backIndex = backIndex - 1;
}

NullJason

function findLastPosition(waitlist: string[], personName: string): number {
  for (let i = waitlist.length-1; i>=0 ; i--) {
    if (waitlist[i] === personName) {
      return i;
    }
  }
  return -1;
}
let tonightsWaitlist = ["Priya", "Sam", "Jordan", "Sam", "Lee"];
console.log(findLastPosition(tonightsWaitlist, "Sam"));

NullJason

let limit:number = 100;
let count:number = 0;
for(let i = 1; i<=limit; i++){
    if (i%7===0) count ++
}
console.log(count)

NullJason

let sumlimit:number = 100;
let total:number = 0;
for(let i = 1; i<=sumlimit; i++){
    if (i%2===0) total += i
}
console.log(total)

NullJason

/* Predict:
0+1=1 1+1=2.
the growth of vine is the previous two added, n-1+n-2, which is basically fibonacci
*/

// A vine's new growth each week equals the total of the previous
// two weeks' growth. Week 0 grew 0 cm, week 1 grew 1 cm.
let lastWeekGrowth: number = 0;
let thisWeekGrowth: number = 1;
for (let week = 1; week <= 5; week++) {

NullJason

/* Predict:
40, 20, 10, 5, 2, 1
0, 1, 2, 3, 4, 5
*/

// A knockout tournament: each round, half the players are eliminated
// (odd player out sits the round). How many rounds until a winner?
let playersLeft: number = 1000;
let roundsPlayed: number = 0;
while (playersLeft > 1) {