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An array contains items at each index starting from first(0) to last(array.length - 1) is called as Dense array. Whereas if at least one item is missing at any index, the array is called as sparse.
Let's see the below two kind of arrays,
js
1const avengers = ["Ironman", "Hulk", "CaptainAmerica"];
2
3console.log(avengers[0]); // 'Ironman'
4
5console.log(avengers[1]); // 'Hulk'
6
7console.log(avengers[2]); // 'CaptainAmerica'
8
9console.log(avengers.length); // 3
10
11const justiceLeague = ["Superman", "Aquaman", , "Batman"];
12
13console.log(justiceLeague[0]); // 'Superman'
14
15console.log(justiceLeague[1]); // 'Aquaman'
16
17console.log(justiceLeague[2]); // undefined
18
19console.log(justiceLeague[3]); // 'Batman'
20
21console.log(justiceLeague.length); // 4Advertisement
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