// 2. pop()

let arrPop = [1, 2, 3, 4, 5];
let popped = arrPop.pop();
console.log(popped); // Output: 5
console.log(arrPop); // Output: [1, 2, 3, 4]

// 3. shift()

let arrShift = [1, 2, 3, 4, 5];
let shifted = arrShift.shift();
console.log(shifted); // Output: 1
console.log(arrShift); // Output: [2, 3, 4, 5]

// 4. unshift()

let arrUnshift = [1, 2, 3];
arrUnshift.unshift(-3, -2, -1, 0);
console.log(arrUnshift); // Output: [-3, -2, -1, 0, 1, 2, 3]

// 5. splice()

let arrSplice = [1, 2, 3, 4, 5];
arrSplice.splice(2, 1, 'a', 'b');
console.log(arrSplice); // Output: [1, 2, 'a', 'b', 4, 5]

// 6. slice()

let arrSlice = [1, 2, 3, 4, 5];
let sliced = arrSlice.slice(1, 4);
console.log(sliced); // Output: [2, 3, 4]

// 7. concat()

let arrConcat1 = [1, 2, 3];
let arrConcat2 = [4, 5];
let concatenated = arrConcat1.concat(arrConcat2);
console.log(concatenated); // Output: [1, 2, 3, 4, 5]

// 8. indexOf()

let arrIndexOf = [1, 2, 3, 4, 5, 4];
let index = arrIndexOf.indexOf(4);
console.log(index); // Output: 3

// 9. lastIndexOf()

let arrLastIndexOf = [1, 2, 3, 4, 5, 4];
let lastIndex = arrLastIndexOf.lastIndexOf(4);
console.log(lastIndex); // Output: 5

// 10. includes()

let arrIncludes = [1, 2, 3, 4, 5];
let included = arrIncludes.includes(3);
console.log(included); // Output: true

// 11. forEach()

let arrForEach = [1, 2, 3, 4, 5];
arrForEach.forEach(element => {
  console.log(element);
});
// Output: 1, 2, 3, 4, 5 (each element on a new line)

// 12. map()

let arrMap = [1, 2, 3];
let mapped = arrMap.map(element => element * 2);
console.log(mapped); // Output: [2, 4, 6]

// 13. filter()

let arrFilter = [1, 2, 3, 4, 5];
let filtered = arrFilter.filter(element => element > 2);
console.log(filtered); // Output: [3, 4, 5]

// 14. reduce()

let arrReduce = [1, 2, 3, 4, 5];
let reduced = arrReduce.reduce((accumulator, currentValue) => accumulator + currentValue);
console.log(reduced); // Output: 15

// 15. every()

let arrEvery = [1, 2, 3, 4, 5];
let isEvery = arrEvery.every(element => element > 0);
console.log(isEvery); // Output: true

// 16. some()

let arrSome = [1, 2, 3, 4, 5];
let isSome = arrSome.some(element => element > 4);
console.log(isSome); // Output: true

// 17. join()

let arrJoin = [1, 2, 3];
let joined = arrJoin.join('-');
console.log(joined); // Output: "1-2-3"

// 18. reverse()

let arrReverse = [1, 2, 3];
arrReverse.reverse();
console.log(arrReverse); // Output: [3, 2, 1]

// 19. sort()

let arrSort = [3, 1, 2];
arrSort.sort();
console.log(arrSort); // Output: [1, 2, 3]

// 20. find()

let arrFind = [1, 2, 3, 4, 5];
let found = arrFind.find(element => element > 2);
console.log(found); // Output: 3

Array (known as List) functions of javascript 👆

String functions in js 👇