JAVASCRIPT

JSON var obj = {"name": "Hari", "city":"Trichy,"Mother Tongue":"Tamil"} var obj1 = [{ name : "book" , price : 100 },{ name : "note" , price : 50 },{ name : "pen" , price : 10 },{ name : "pencil" , price : 5 }] var obj2 = { "name" : "santhosh" , "marks" :[ 89 , 90 , 95 , 100 ]} var arr = [1,2,3,4,5,6] ARRAY METHOD / JSON ARRAY FILTER arr . filter (( item ) => item < 4 )  //[1,2,3] function   even  ( num ){ if ( num % 2 == 0 )  return   "even" } arr . filter (( even ))  // [2,4] obj1 . filter (( item ) => item . price <= 10 ) [{  name :   "pen" ,  price :   10  },{  name :   "pencil" ,  price :   5  }] MAP arr . map (( item ) => item + 1 )  // [2,3,4,5,6,7] obj1 . map (( item ) => item . name )  // [ "book", "note", "pen", "pencil" ] REDUCE arr . reduce (( currentva...

JS METHODS STRING ARRAY Array.from() Array.isArray() Array.of() Array.prototype.concat() Array.prototype.copyWithin() Array.prototype.entries() Array.prototype.every() Array.prototype.fill() Array.prototype.filter() Array.prototype.find() Array.prototype.findIndex() Array.prototype.flat() Array.prototype.flatMap() Array.prototype.forEach() Array.prototype.includes() Array.prototype.indexOf() Array.prototype.join() Array.prototype.keys() Array.prototype.lastIndexOf() Array.prototype.map() Array.prototype.pop() Array.prototype.push() Array.prototype.reduce() Array.prototype.reduceRight() Array.prototype.reverse() Array.prototype.shift() Array.prototype.slice() Array.prototype.some() Array.prototype.sort() Array.prototype.splice() Array.prototype.toLocaleString() Array.prototype.toSource() Array.prototype.toString() Array.prototype.unshift() Array.prototype.values() Array.prototype[@@iterator]() get Array[@@species]

FUNCTION function   add  ( a , b ) { var   c  =  a + b ; return   c } var   ans  =  add ( 4 , 5 ) console . log ( ans ) ANAYMOUS FUNCTION var   add  =  function  ( a , b ) { var   c  =  a + b ; return   c } var   res  =  add ( 5 , 5 ) console . log ( res ) IIFE - Immediately Invoked Functional Expression ( function  ( a , b ) { var   c  =  a + b ; console . log   c })( 6 , 8 ) ARROW FUNCTION var   add  =( a , b )  => return   a + b ; var   res  =  add ( 5 , 5 ) console . log ( res ) function   add  ( a , b ) { var   c  =  a + b ; return   c } var   add  = function ( a , b ) { var   c  =  a + b ; return   c } ( function ( a , b ) { var   c  =  a + b ; return   c })( 4.5 ) var   add  =( a , b )  => return   a + b ; PARAMETER ...

ODD OR EVEN function oddeven (num) {if(num%2==0) return "even"; else return "odd"}