javascript add item by index

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Lucia
11 Apr 2018
1var arr = [];
2arr[0] = "Jani";
3arr[1] = "Hege";
4arr[2] = "Stale";
5arr[3] = "Kai Jim";
6arr[4] = "Borge";
7
8console.log(arr.join()); // Jani,Hege,Stale,Kai Jim,Borge
9arr.splice(2, 0, "Lene");
10console.log(arr.join()); // Jani,Hege,Lene,Stale,Kai Jim,Borge
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Federica
16 Sep 2019
1// Be careful!
2
3const arr = [ 1, 2, 3, 4 ];
4arr[5] = 'Hello, world!';
5
6console.log(arr); // [ 1, 2, 3, 4, <1 empty item>, 'Hello, world!' ]
7console.log(arr.length); // 6
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Juan Sebastián
28 May 2020
1a1.splice(2, 0, ...a2);
2
source
Stefano
18 Feb 2016
1const arr = [ 1, 2, 3, 4 ];
2arr[5] = 'Hello, world!';
3
4console.log(arr); // [ 1, 2, 3, 4, <1 empty item>, 'Hello, world!' ]
5console.log(arr.length); // 6
source
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