Day3.md

Day 3 : Quiz project and Functions

Today was a productive day of revision and practice. I refreshed my understanding of previous topics, completing exercises and working on a project that applied those lessons. In addition, I explored new topics like functions and scope, specifically the differences between "let," "const," and "var" in terms of scope. It was an enlightening experience that expanded my knowledge of JavaScript

Lessons Summary

• Comments is important in JS, it Help others (and yourself)understand your code.
• Functions is used to do actions it has a parameters and it returns a value .
• Arrow function is unnamed function without much code.
• Scope determines where variables are "in play".
• There are kinds of scope like global scope it is the widest scope.
• There is a difference between "let" and "var" in their scope

Coding Examples

// Example 1: declare the following functions :
//1. multiply: given 2 numbers, return their product
 function product(n1,n2)
 { return n1*n2;
 }
 //2.longerThan: given 2 arrays, return whether the first is 
 longer than the second
 function longerThan(a1, a2) {
 return a1.length>a2.length;
 }

 //Example 2 :declare function using arrow functions:

//divide: given 2 numbers, return the first divided by the second
 
 const divide=(n1,n2)=>n1/n2;

//Example 3:  declare and object called fact with statement 
property and answer and explanation 

    const fact = {
    statement:"Arrays like objects",
    answer:true,
    explanation: "Arrays are kind of objects with special properties "
   };

Coding Exercises

Return a Value from a Function with Return

My Solution :

function timesFive (num){
return num*5;
}

Global Scope and Functions

My Solution :

let myGlobal =10;
let oopsGlobal;

function fun1( ) {
  oopsGlobal =5;
}

function fun2() {
  let output = "";
  if (typeof myGlobal != "undefined") {
    output += "myGlobal: " + myGlobal;
  }
  if (typeof oopsGlobal != "undefined") {
    output += " oopsGlobal: " + oopsGlobal;
  }
  console.log(output);
}

Local Scope and Functions

My Solution :

function myLocalScope() {
let myVar;
  console.log('inside myLocalScope', myVar);
}
myLocalScope();
console.log('outside myLocalScope', myVar);

Global vs. Local Scope in Functions

My Solution :

const outerWear = "T-Shirt";

function myOutfit() {
  const outerWear="sweater";
  return outerWear;
}
myOutfit();

Stand in Line

My Solution :

function nextInLine(arr, item) {
  arr.push(item);
  const removed = arr.shift();
  return removed;
}