gistfile1.txt

// Question 1: Anonymous Function
// Write an anonymous function that takes two numbers as parameters and returns their sum.
var add = function (a, b) {
  return a + b
}
var sum = add(3, 4)
console.log(sum)


console.log("\n-------------------------------------------------\n");

// 2. Write a function `isEven` that takes a number as a parameter and returns `true` if it is even, and `false` otherwise.
function isEven (x) {
  return x % 2 === 0
}
console.log(isEven(4))
console.log(isEven(5))


console.log("\n-------------------------------------------------\n");

// 3. Implement a function that checks if a given number is a palindrome (e.g., 121, 1331).

// 123321

function isPalindrome (x) {
  if (x < 0) {
    return false
  }

  var original = x
  var reversed = 0

  while (x > 0) {
    var scaled = reversed * 10
    var remainder = x % 10
    reversed = scaled + remainder
    x = (x - remainder) / 10
  }

  return original === reversed
}

console.log(isPalindrome(151))
console.log(isPalindrome(123))

console.log("\n-------------------------------------------------\n");

// 4. Scope - Global and Local
// Write a function that demonstrates the concept of global and local scope. The function should have a local variable and a global variable, and it should print their values.

var global = 'hi'

function test () {
  var local = 'bye'
  console.log(global)
  console.log(local)
}

test()

console.log("\n-------------------------------------------------\n");


// 5. Anonymous Function as a Parameter
// Write a function that takes an anonymous function as a parameter and invokes it.

function higher (callback) {
  callback()
}
higher(() => console.log('lower'))

console.log("\n-------------------------------------------------\n");


// 6.  IIFE Returning a Value
// Write an IIFE that returns the square of a number and assign the result to a variable.

(function () {
  console.log('anonymous')
})()

console.log("\n-------------------------------------------------\n");

// 7. Arrow functions
// Define an arrow function that returns the cube of a number and assign the returned value to a variable.

var cube = x => x * x * x
var cubed = cube(5)
console.log(cubed)

console.log("\n-------------------------------------------------\n");

// 8. Arrow Function
// Write a function to print a right angle triangle of stars. Use arrow function which takes a number as a parameter that represents the number of lines in the triangle.

// *
// **
// ***
// ****

var rightAngleTriangle = (x) => {
  for (var i = 1; i <= x; i++) {
    var row = ''
    for (var j = 1; j <= i; j++) {
      row += '*'
    }
    console.log(row)
  }
}

rightAngleTriangle(5)

console.log("\n-------------------------------------------------\n");