how to use indexof in typesript

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Henri
15 May 2019
1var array = [2, 9, 9];
2array.indexOf(2);     // 0
3array.indexOf(7);     // -1
4array.indexOf(9, 2);  // 2
5array.indexOf(2, -1); // -1
6array.indexOf(2, -3); // 0
7
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indexable type in tsindex signature in typescript
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