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Function in Javascript

  function Nickname (){     console . log ( "D" );     console . log ( "E" );     console . log ( "B" );     console . log ( "A" ); } // Nickname() // function add(num1, num2){ //     console.log(num1+num2); // } function add ( num1 , num2 ){     // let result = num1 + num2     // return result     return num1 + num2 } // const result = add(10,20) // console.log("Result: ",result); function login ( username ) {     if ( username === undefined ){         console . log ( "Please enter user name" )         return     }     return ` ${ username } Just logged in` } // console.log(login()); // ====== function calculate ( ... num1 ){     return num1 } // console.log(calculate(200,450,250)); const user = {     username : "Aditya" ,     price : 252 } function handleobj ( anyobject ){    ...
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Object in Javascript

  // Singletons (Type Of Object) //object.create //Object literals(This Part 1) //Part 1 const mysym = Symbol ( "Key1" )   //Symbol Declaration const Jsuser = {     name : "Debadatta" ,     age : 19 ,     location : "Cuttack" ,     email : "debadatta@gmail.com" ,     isloggedIn : false ,     lastlogindays : [ "Mon" , "Wed" , "Sat" ],     "Pf account" : "y" ,     [ mysym ]: "Symbol1" } // console.log(Jsuser.lastlogindays); // console.log(Jsuser["lastlogindays"]); // console.log(Jsuser["Pf account"]); // console.log(Jsuser[mysym]) // console.log(typeof Jsuser[mysym]) // console.log(Jsuser); // Jsuser.greetings = function(){ //     console.log("Hello Debadatta"); // } // Jsuser.greetingsTwo = function(){ //     console.log(`Hello Debadatta,${this.email}`); // } // console.log(Jsuser.greetings()); // console.log(Jsuser.greetingsTwo()); //Object Freze /...
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Array in function Javascript

  const ranger = [ "Troy" , "Jake" , "Noah" ] const rangerd = [ "Tylor" , "Chase" , "Koda" ] // ranger.push(rangerd) // const allranger = ranger.concat(rangerd) // console.log(allranger); // console.log(Array.isArray("Debadatta")); // console.log(Array.from("Debadatta")); // console.log(Array.isArray({name:"Debadatta"}));// Intresting let score1 = 100 let score2 = 200 let score3 = 300 console . log ( Array . of ( score1 , score2 , score3 ));
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Comparison in Javascript

  //There are many types of simple comparison where we shuld only focus for limited time //ex-Equal,Greaterthan,Lessthan etc // console.log("2">1); // console.log("02">1); // console.log(null > 0); // console.log(null == 0); // console.log(null >= 0); //Avoid this type of comparison as much as possible // === it compares the datatypes also console . log ( "2" === 2 ); //False because of different datatypes //Summary //Primitive //7 tytpes-String,Number,Boolean,Null,undefined,Symbol,BigInt //Reference (Non Primitive) //Array, Objects, Function, //+++++++++++++++++++++++++++++++++ //Memory //Stack(Primitive), Heap(Non-Primitive)
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Array in Javascript

  // Array let myarr = [ 0 , 1 , 2 , 3 , 4 , 5 ] console . log ( myarr . length ); // Array Methods myarr . push ( 6 , 7 ) console . log ( myarr ); // slice,splice const myn1 = myarr . slice ( 0 , 4 ) console . log ( myn1 );
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Conversion in Javascript

  //let score = "55" // console.log(typeof score); // console.log(typeof (score)); // let ValueIsNumber = Number(score) //console.log(typeof (ValueIsNumber)); //"33" - 33 //"33abc" - Nan //true - 1, false - 0 //let IsloggedIn = 1 // let Booleancon = Boolean(IsloggedIn) // console.log(typeof (Booleancon)); //console.log(Booleancon) //1-true,0-false //""-Empty-false //"Debadatta" - true //                      Operations let value = 3 let negvalue = - value //console.log(negvalue); //console.log(2+2); //There are different types datatypes conversion. //Refer to ECMA documentation.
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Datatypes in Javascript

  "use strict" ; //treat all JS code as  newer version //alert(3+3); (used id browser) /*We are using Node.js not browser*/ //Code realiabity should be used //Ecma is standard of browsers in javascript //Primitive Datatype let name = "Debadatta" /*String (used in single coat and double coat, Dc should be prefered)*/ let age = 18 //Numeric (range 2 to the power 53)/Let isloggedIn = false //Boolean (true or false) //null- standalone value (it's not same as zero), It is a object //undefined //symbol - Unique //Not Primitive console . log ( typeof [ "Debadatta" , 18 , false ]);
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