NhanKhangg98

function lengthOfString(str){
    return str.length ? lengthOfString(str.substring(1)) + 1 : 0
    }

NhanKhangg98

function flatten(nums) {
  const arr = [];

  nums.forEach((num: Number[]) => {
    if (Array.isArray(num)) {
      arr.push(...flatten(num));
    } else {
      arr.push(num);
    }
  });

NhanKhangg98

function checkIfPangram(sentence: string): boolean {
    let seen = new Set()
    for(let i=0;i<sentence.length;i++){
        seen.add(sentence[i]);
    }

    if(seen.size === 26){
       return true; 
    } else {
        return false;

NhanKhangg98

var maxArea = function(height: number[]) {
    let maxArea = 0;
    for (let i = 0; i < height.length; i++) {
      for (let j = i+1; j < height.length; j++) {
        let h = Math.min(height[i], height[j]);
        let w = j - i;
        let area = h * w;
        maxArea = Math.max(area, maxArea);
      }
    }

NhanKhangg98

function findProduct(...arr:number[]): number[]{
    let rt: number[] = [];
    let temp = 1;
    for (let i = 0; i < arr.length; i++) {
         rt[i] = temp
        temp *= arr[i]
    }
    temp = 1
    for (let j = arr.length-1; j >= 0; j--) {
        rt[j] *= temp

NhanKhangg98

//1

const push = (array: number[], num: number) => {
    array[array.length] = num;
    return array
}

// 2
const pop = (array: number[]) => {
    array.length--

NhanKhangg98

type Restaurant = {
    name: string,
    priceBracket: Enumerator<PriceBracket>,
    deliveryTimeMinutes: number,
    openHour: string,
    closeHour: string,
    distance: number,
}

type Order = {

NhanKhangg98

type Movie = {
    readonly title: string,
    originalTitle?: string,
    director: string,
    releaseYear: number,
    boxOffice: {
        budget: number,
        grossUS: number,
        grossWorldwide: number,
    },

NhanKhangg98

function twoFer(name: string = "you"): string {
    return `one for ${name}, one for me`
}

function isLeapYear(year: number): boolean {
    return (year % 100 !== 0 && year % 4 ===0) || year % 400 === 0;
}

NhanKhangg98

// 1
const indexOf = (arr, item) =>  arr.indexOf(item);
    
   


indexOf([1,2,3,4], 3) 
indexOf([5,6,7,8], 8) 
indexOf([1,2,3,4], 5)