valerymelou

// Example 1
const order = [20.17, 18.67, 1.50, "cheese", "eggs", "milk", "bread"];
const [total, subtotal, tax, ...items] = order;
console.log(total, subtotal, tax, items);  // 20.17 18.67 1.5 ["cheese", "eggs", "milk", "bread"]

// Example 2
function sum(...nums) {
  let total = 0;  
  for(const num of nums) {
    total += num;

valerymelou

// Example 1
const books = ["Don Quixote", "The Hobbit", "Alice in Wonderland", "Tale of Two Cities"];
console.log(...books);  // Don Quixote The Hobbit Alice in Wonderland Tale of Two Cities

// Example 2
const primes = [2, 3, 5, 7, 11, 13, 17, 19, 23, 29];
console.log(...primes);  // 2 3 5 7 11 13 17 19 23 29

// Example 3
const fruits = ["apples", "bananas", "pears"];

valerymelou

Array.prototype.decimalfy = function() {
  for (i = 0; i < this.length; i++) {
    this[i] = this[i].toFixed(2);
  }
};

const digits = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9];

for (const digit of digits) {
  console.log(digit);

valerymelou

const digits = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9];

for (const digit of digits) {
  if (digit % 2 === 0) {
    continue;
  }
  console.log(digit);
}

/**

valerymelou

const digits = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9];

for (const digit of digits) {
  console.log(digit);
}

/**
 0
 1
 2

valerymelou

Array.prototype.decimalfy = function() {
  for (var i = 0; i < this.length; i++) {
    this[i] = this[i].toFixed(2);
  }
};

var digits = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9];

for (var index in digits) {
  console.log(digits[index]);

valerymelou

var digits = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9];

for (var index in digits) {
  console.log(digits[index]);
}

/**
 0
 1
 2

valerymelou

var digits = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9];

for (var i = 0; i < digits.length; i++) {
  console.log(digits[i]);
}

/**
 0
 1
 2

valerymelou

const firstName = "John";
const lastName = "Doe";
const birth = 1980;
const death = 1990;

const person = {
  firstName,
  lastName,
  age() {
    return death - birth;

valerymelou

const firstName = "John";
const lastName = "Doe";
const age = 10;

const person = {
  firstName,
  lastName,
  age,
}