MY ZEN CLASS

  ASYNC &  NON-BLOCK LANGUAGE             Using below website we can check how javascript is working and understand why its async and non block   http://latentflip.com/loupe/   PROGRAM TO CHECK   console . log ( '1.start'  )  setTimeout ( function (){ console . log ( '2.After 1 sec' )}, 1000 )  setTimeout ( function (){ console . log ( '3.After 0 sec' )}, 0 )  console . log ( '4.Stop' )   To change this Non-Block mode to Block mode we can use Call Back   Call Back Hell -- Multi nested callback 

  APPEND FORM DATA TO TABLE

  Recursive Function Random Number Generator Age calculator Date Manipulation Combine MRF

  Normal,Async,Defer Session Storage Cookie Local Storage space invader game

Given a number N and an array of N elements, find the Bitwise XOR of the array elements. Input Size : N <= 100000 Sample Testcase : INPUT 2 2 4 OUTPUT 6   // ONE TESTCASE PASSED const   readline  =  require ( "readline" ); const   inp  =  readline . createInterface ({    input :   process . stdin }); const   userInput  = []; inp . on ( "line" , ( data )  =>  {    userInput . push ( data ); }); inp . on ( "close" , ()  =>  {    var   N  =  Number ( userInput [ 0 ]);    var   str  = String ( userInput [ 1 ])    var   arr  =  str . split ( ' ' ). map (( val ) => Number ( val ))       var   first  =  arr [ 0 ]       for ( i = 1 ; i < N ; i ++)   {  first  = first ^ arr [ i ]}    console . log ( first ...

  DOM – DOCUMENT OBJECT MODE   HTML DOC –Browser – Browser Engine(html parser) – DOM   Tree structure takes less time for searching that’s why we prefer tree structure in DOM. Why we prefer object model? Object model means OOPS concept based it have features like data abstraction, encapsulation…. Window   -- Window is the default thing available in the Browser’s JavaScript Engine. Document -- Document is property of Window Screen – Physical dimension of   the browser   Draw some sampl tree We can create html with the help of tag and make it dynamic(to do some action) by adding   javascript   using script tag then why specifically we need this dom à Will understand in future classes that we can’t do something directly with the tag.   DOM MANIPULATION   var element =document.createElement(‘tag’) Element.setAttribute(“attribute”,”name”) If we have morethan one same attribute for the element we can’t use s...