BolajiAyodeji

let obj = {
  key1: "value1",
  key2: "value2",
  key3: "value3"
}
let items = Object.values(obj);
console.log(items);
// ["value1", "value2", "value3"]
items.map(value => {
 console.log(value)

BolajiAyodeji

let obj = {
  key1: "value1",
  key2: "value2",
  key3: "value3"
}
let items = Object.keys(obj);
console.log(items);
// ["key1", "key2", "key3"]
items.map(key => {
 let value = obj[key];

BolajiAyodeji

let obj = {
  key1: "value1",
  key2: "value2",
  key3: "value3"
}
for (let key in obj) {
  let value = obj[key];
  console.log(key, value);
}
// key1 value1

BolajiAyodeji

// for... in loop
let start = performance.now();
let obj = {
  key1: "value1",
  key2: "value2",
  key3: "value3"
}
for (let key in obj) {
  let value = obj[key];
  console.log(key, value);

BolajiAyodeji

function countOccurences(array, searchElement) {
  if (!Array.isArray(array)) {
    throw new Error('Enter a valid array');
  }
  return array.reduce((accumulator, current) => {
    const occurence = (current === searchElement) ? 1 : 0;
    return accumulator + occurence;
  }, 0)
}

BolajiAyodeji

// method (function inside an object) -> object
// function -> global (window, global)

const video = {
  title: 'Bird Box',
  tags: ['english', 'french', 'chineese'],
  showTags() {
    this.tags.forEach(tag => {
      console.log(this.title, tag);
    });

BolajiAyodeji

const person = {
  firstName: 'Bolaji',
  lastName: 'Ayodeji',
  get fullName() {
    return `${person.firstName} ${person.lastName}`
  },
  set fullName(value) {
    if(typeof value !== 'string') {
      throw new Error('Value is not a string');
    }

BolajiAyodeji

function interest(principal, rate, years) {
  rate = rate || 3.5;
  years = years || 5;

  return (principal * rate) / 100 * (years)
}

console.log(interest(10000));

BolajiAyodeji

function sum(discount, ...prices) {
  const total = prices.reduce((a, b) => a + b);
  return total * (1 - discount);
}
console.log(sum(0.1, 20, 30, 1));

BolajiAyodeji

// Function Declaration
function walk() {
  console.log('walk');
}

// Named Function Expression
let run1 = function walk() {
  console.log('run1');
};