script.js

function calculateSum(arr) {
    let sum = 0;
    for (let i = 0; i < arr.length; i++) {
      sum += arr[i];
    }
    return sum;
  }
  
  let numbers = [1, 2, 3, 4];                     
  console.log("Sum:", calculateSum(numbers));
// output
/*
Sum: 10
*/

function isEven(num) {
    if (num % 2 === 0) {
      return true;
    } else {
      return false;
    }
  }
  
  console.log(isEven(4));
  console.log(isEven(7));
  console.log(isEven(0));
// output
/*
true
false
true
*/

function greet(name) {
    return "Hello, " + name + "!";
  }
  
  function personalizedGreeting(names) {
    for (let i = 0; i < names.length; i++) {
      console.log(greet(names[i]));
    }
  }
  
  let friends = ["Alice", "Bob", "Charlie"];
  personalizedGreeting(friends);
//output
/*
["Hello, Alice!", "Hello, Bob!", "Hello, Charlie!"]
*/

function reverseArray(arr) {
    let reversed = [];
    for (let i = arr.length - 1; i >= 0; i--) {
      reversed.push(arr[i]);
    }
    return reversed;
  }
  
  let originalArray = [10, 20, 30];
  console.log(reverseArray(originalArray));
  console.log(originalArray);
//output
/*
[ 30, 20, 10 ]
[ 10, 20, 30 ]
*/

function multiplyMatrix(matrix) {
    for (let i = 0; i < matrix.length; i++) {
      for (let j = 0; j < matrix[i].length; j++) {
        matrix[i][j] *= 2;
      }
    }
    return matrix;
  }
  
  let matrix = [
    [1, 2],
    [3, 4],
  ];
  console.log(multiplyMatrix(matrix));
//output
/*
[ [1, 4], [3, 8] ]
*/