1+ //Array
2+ /*
3+ Collection Of items
4+ */
5+ let marks = [ 27 , 56 , 98 , 65 , 87 , 60 ] ;
6+ let sum = 0 ;
7+ for ( let val of marks ) {
8+ sum = sum + val ;
9+ }
10+ let avg = sum / marks . length ;
11+ console . log ( `Sum of the marks=${ sum } ) ;
12+ console . log ( `Average of marks=${ avg } ) ;
13+
14+ //Arrays in loops
15+ let cities = [ "Delhi" , "Kolkata" , "Pune" , "Bangalore" ] ;
16+ for ( let city of cities ) {
17+ console . log ( city )
18+ }
19+
20+
21+ //Q2
22+ let items = [ 65 , 98 , 78 , 63 , 21 , 56 ] ;
23+ for ( let i = 0 ; i < items . length ; i ++ ) {
24+ let offer = items [ i ] / 10 ;
25+ items [ i ] -= offer ;
26+ }
27+ console . log ( items ) ;
28+
29+
30+ //push this method add the items in last index
31+ let fooditems = [ "potato" , "apple" , "litchi" ] ;
32+ console . log ( "Before Push =" , fooditems ) ;
33+ fooditems . push ( "chips" ) ;
34+ console . log ( " After push Food items are =" , fooditems ) ;
35+
36+ //pop this method delete from end
37+ let fitems = [ "potato" , "apple" , "litchi" ] ;
38+ console . log ( "Before pop =" , fitems ) ;
39+ let del = fitems . pop ( ) ;
40+ console . log ( " After pop Food items are =" , fitems ) ;
41+ console . log ( "Deleted item is=" , del )
42+
43+
44+ //ToString coverts the array to string
45+ let cgpa = [ 8 , 9 , 7 , 8.3 , 7.5 ] ;
46+ console . log ( "Array is=" , cgpa ) ;
47+ console . log ( "Converted into String=" , cgpa . toString ( ) ) ;
48+
49+
50+ //concat Array
51+ let marvel = [ "Thor" , "Ironman" , "Spiderman" ] ;
52+ let dc = [ "Batman" , "Superman" , "Wonder Woman" ] ;
53+ console . log ( "marvel=" , marvel ) ;
54+ console . log ( "dc=" , dc ) ;
55+ let hero = marvel . concat ( dc ) ;
56+ console . log ( "After Concat =" , hero ) ;
57+
58+ //unshift add to start
59+ //shift delete from start
60+ let ab = [ 1 , 2 , 3 , 5 ] ;
61+ console . log ( "Before unshift" , ab ) ;
62+ let b = ab . unshift ( 9 ) ;
63+ console . log ( "After unshift" , ab ) ;
64+ let c = ab . shift ( ) ;
65+ console . log ( "After Shift=" , ab ) ;
66+
67+
68+ //slice
69+ let bc = [ 1 , 2 , 3 , 4 , 5 ] ;
70+ console . log ( "Array=" , bc ) ;
71+ console . log ( bc . slice ( 1 , 2 ) ) ;
72+
73+ //splice add delete replace the element
74+ let arr = [ 5 , 6 , 9 , 8 , 3 ] ;
75+ console . log ( "Array is" , arr ) ;
76+ arr . splice ( 2 , 0 , 10 ) ; // add 2 is index 0 deleted item 10 inserted item
77+ console . log ( "after Insertion=" , arr ) ;
78+ arr . splice ( 3 , 1 ) //delete 3 is index no 1 number of deletion
79+ console . log ( "After Deletion=" , arr ) ;
80+ arr . splice ( 4 , 1 , 11 ) ; //replace 4 index no 1 number of deletion 11 inserted instead of
81+ console . log ( "After Replace" , arr ) ;
82+
83+ //Practice 1
84+ let company = [ "Bloomberg" , "Microsoft" , "Uber" , "Google" , "IBM" , "Netflix" ] ;
85+ console . log ( "Companies" , company ) ;
86+
87+ //Remove first Company From Array
88+
89+ console . log ( "Delete the First Company=" , company . shift ( ) ) ; //delete from start
90+ console . log ( "After deletion" , company ) ;
91+
92+ //Remove Uber & add Ola (replace)
93+
94+ company . splice ( 1 , 1 , "Ola" ) // 1 is index no 1 deleted "Ola" is added
95+ console . log ( "After Replacement of Uber added item is Ola" , company ) ;
96+
97+ //Add "Amazon" at the end
98+ company . push ( "Amazon" ) ;
99+ console . log ( "After Pushing at the end" , company ) ;
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