2.js

//CREATING VARIABLES
let age=10;
const name="Alfred";
console.log(age);

//REASSIGNING(CHANGING)VAULES
age=15;
console.log(age);
console.log(name);

//NAMING CONVENTIONS
//FIRSTNAME,firstname,firstName,first_name,Firstname
//DATATYPES
//STRINGS
let str='I am  boy'
str=" i'm a coder"
//NUMBERS
let num=20;
num=-20;
num=20.237;
//BOOLEAN
let ismale=true;
let isfemale=false;
//NULL
let num1=null
//UNDEFINED
let boy ;
console.log(boy)

//COMPOSITE DATATYPES
//ARRAY[]
let names=['Alfred','May',5,1999,true]
//OBJECTS{}
let studentDetails={
    name:"Alfred",
    class:"12th grade",
    school:"Aptech",
    favcolor:"Green"  
};
//FUNCTIONS
function alertMyName(){
    alert('Alfred');
}
//INVOVLE OR CALLING FUNCTION
//DOCUMENTS.METHODS
alertMyName()
let newName='Frank';
document.write('My name is ' +  newName)