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 Use of Let, Var and Const in Javascript along with their Scopes The data type "var" can be used to redeclare or assign a variable n number of times without any troubles. But the data type "Let" can be initialised only once and cannot be initialized again and again. However it can be assigned n number of times but it cannot be initialised. What i essentially mean can be understood with the below given example: CASE 1 ( VAR Data type): Var Name = "Rishu";  // here i have initialised my variable "Name" and declared its value as                                               //   well as "Rishu"; Var Name = "Calc";    // re initialized the value of Name as "Calc"  console.log(Name);     // It will print Calc without any error CASE 2 ( Let Data type): Let Name = "Rishu";  // here i have initiali...

 Arrow function example

 getAttribute and setAttribute() in Javascript

HISTORY OBJECT ALONG WITH ITS PROPERTIES AND METHODS

 Replace method in window property inside JavaScript

 scrollTo and scrollBy in Javsscript

 resizeBy and resizeTo window property in Javascript

 moveTo() and moveBy() using window in Javascript

 HOW TO OPEN AND CLOSE WINDOW USING WINDOW OBJECT IN JAVASCRIPT

 Window Height and Window Width methods under BOM manipulation in Javscript

 SetTimeout() and ClearTimeout()

 setInterval() and clearInterval() in Javascript

COMPLETE FORM VALIDATION USING JAVASCRIPT

  <! DOCTYPE   html > < html   lang = "en"   id = "hello" > < head >    < meta   charset = "UTF-8" >    < meta   name = "viewport"   content = "width=device-width, initial-scale=1.0" >    < meta   http-equiv = "X-UA-Compatible"   content = "ie=edge" >    < title > Email Validation under Form validation in Javascript </title >    < link   rel = "stylesheet"   href = "latesttest.css" > </ head > < body >        < form   onsubmit = "   return   validation () " >           EMAIL ID  < input   id = "user"   type = "email"   placeholder = "EMAIL ID"   required >< br >< br >           PASSWORD  < input   id ...