1+ const a = [ 11 , 22 , 33 , 44 ] ;
2+ a . splice ( 3 , 0 , true ) ;
3+ console . log ( a ) ;
4+ 5+ const newArray = [ "Ashish" , "Ashu" , "Kunal" , "Kevin" ] ;
6+ newArray . splice ( 0 , 0 , "khushi" ) ;
7+ newArray . splice ( 0 , 0 , "khushi" ) ;
8+ console . log ( newArray ) ;
9+ 10+ // Map
11+ 12+ const newAry = [ 1 , 2 , 3 , 4 , 5 , 6 , 7 , 8 , 9 ] ;
13+ let neOnj = newAry . map ( function ( newAry ) {
14+ return newAry * 2 ;
15+ } ) ;
16+ 17+ console . log ( neOnj ) ;
18+ 19+ const sqr = [ 2 , 3 , 4 , 5 , 6 , 7 ] ;
20+ const doble = sqr . map ( ( num ) => num * num ) ;
21+ console . log ( doble ) ;
22+ 23+ const user = [
24+ { id : 1 , name : "Ashish" } ,
25+ { id : 2 , name : "Khushi" } ,
26+ { id : 3 , name : "Kunal" } ,
27+ { id : 4 , name : "Harsh" } ,
28+ ] ;
29+ 30+ const names = user . map ( ( user ) => user . name ) ;
31+ console . log ( names ) ;
32+ 33+ // array to string convert join methods
34+ let newT = names . join ( " " ) ;
35+ console . log ( newT ) ;
36+ 37+ // filter ()
38+ 39+ const filterUse = [ 23 , 43 , 35 , 56 , 34 , 65 , 23 , 43 ] ;
40+ let filterS = filterUse . filter ( ( e ) => e > 25 ) ;
41+ console . log ( filterS ) ;
42+ 43+ // all arrya valus sum
44+ let sumPlus = filterUse . reduce ( ( s , m ) => s + m , 0 ) ;
45+ console . log ( sumPlus ) ;
46+ 47+ const ax = [ 12 , 13 , 14 , 15 , 12 , 16 , 17 ] ;
48+ console . log ( ax . indexOf ( 12 ) ) ;
49+ console . log ( ax . lastIndexOf ( 12 ) ) ;
50+ console . log ( ax . includes ( 12 ) ) ;
51+ console . log ( ax . join ( " " ) ) ;
52+ 53+ // sub array using splic()
54+ let smallArray = ax . splice ( 2 , 4 ) ;
55+ console . log ( smallArray ) ;
56+ 57+ // using ... this is
58+ 59+ let az = [ 1 , 2 , 3 , 4 , 5 ] ;
60+ let bz = [ 6 , 7 , 8 , 9 ] ;
61+ let cz = [ 10 , 11 , 12 ] ;
62+ 63+ let addArray = [ ...az , ...bz , ...cz ] ;
64+ console . log ( addArray )
65+ 66+ let ras = az . concat ( az , bz )
67+ console . log ( ras )
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