How many Types of Loops in JavaScript

for (let i = 0; i < 5; i++) {
  console.log(i);  // 0, 1, 2, 3, 4
}

// With array
const fruits = ["Apple", "Banana", "Orange"];
for (let i = 0; i < fruits.length; i++) {
  console.log(fruits[i]);
}

let count = 0;
while (count < 3) {
  console.log(count);  // 0, 1, 2
  count++;
}

let num = 0;
do {
  console.log(num);  // 0, 1, 2
  num++;
} while (num < 3);

const person = { name: "John", age: 30, city: "NYC" };
for (let key in person) {
  console.log(key + ": " + person[key]);
}
 // Output: name: John, age: 30, city: NYC 

 // For arrays (gets index) 
const colors = ["red", "green", "blue"];
for (let index in colors) {
  console.log(index);   // 0, 1, 2 
}

const numbers = [10, 20, 30];
for (let num of numbers) {
  console.log(num);   // 10, 20, 30 
}

 // Works with strings too 
for (let char of "Hello") {
  console.log(char);   // H, e, l, l, o 
}

const items = ["A", "B", "C"];
items.forEach(function(item, index) {
  console.log(index + ": " + item);
});
 // 0: A, 1: B, 2: C 

 // Using arrow function 
items.forEach((item) => console.log(item));

const nums = [1, 2, 3];
const doubled = nums.map(num => num * 2);
console.log(doubled);  // [2, 4, 6]

const scores = [45, 78, 90, 32, 88];
const passing = scores.filter(score => score >= 50);
console.log(passing);  // [78, 90, 88]

const prices = [10, 20, 30];
const total = prices.reduce((sum, price) => sum + price, 0);
console.log(total);  // 60

const ages = [12, 18, 25];
const hasAdult = ages.some(age => age >= 18);
console.log(hasAdult);  // true

const grades = [85, 92, 88];
const allPassing = grades.every(grade => grade >= 70);
console.log(allPassing);  // true