README.md

Part I: Hoisting

Note: Before getting started on these exercises, please be certain that you've read through the root README.md file in this repository.

In order to complete these exercises, open repl.it, choose JavaScript, and then write your code in the left-hand panel. You can run your code using the "Run" button.

Two Forms of Functions

// function declaration
function square(x) {
  return x * x;
}

// function expression
var square = function(x) {
  return x * x;
};

Exercises

Basic Requirements

Rewrite Functions

Rewrite the following function declarations using a function expression:

// 1.
function cube(x) {
  return x * x * x;
}

// 2.
function fullName(first, last) {
  return first + " " + last;
}

// 3.
function power(base, exp) {
  if (exp === 0) {
    return 1;
  }
  return base * power(base, exp - 1);
}

// 4.
function sumCubes(numbers) {
  var total = 0;
  for (var i = 0; i < numbers.length; i++) {
    total = total + cube(numbers[i]);
  }
  return total;
}

Mechanics of Hoisting

Type out your best answers to the following questions:

1. Why does JavaScript output undefined instead of throwing an error in the following code?

console.log(message);
// because the declaration of the varuble is after the console log so message of console log is undefind
//When declering a var the output is undefind 
var message = 'Hi there!';

2. Why does JavaScript throw an error instead of logging undefined in the following code?

   console.log(message);
     // because has already been declared and let value is usssed only once
   let message = 'Hi there!';

3. Explain precisely what happens when the following code is executed.

   console.log(showMessage());

//It will be an error because the code will be read frm the top and the consol will stop at the first line because showMessage is not a function yeet var showMessage = function(){ return 'Hi there!'; }; ```

4. Why does JavaScript not throw any errors when the following code is executed?

console.log(showMessage());
// because the function has allredy been declaired and it is stored
function showMessage(){
  return 'Hi there!';
}

Code Restructuring

Restructure the following instances of code to work correctly:

// 1.
function getValues(values){
 var array=[]
for(var i = 0; i < values.length; i++){
  array.push(values[i]);
}
   return array;
}

var values = [10, 20, 30];

// 2.
console.log(welcome('Charlie', 'Munger'));

function welcome(first, last) {
  var welc= `Welcome, ${first} ${last}! You last logged in on ${lastLogin}.`;
  return welc
};

var lastLogin = '1/1/1970';