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chore: update index
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antfu committed Dec 16, 2021
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5 changes: 5 additions & 0 deletions questions/5153-medium-indexof/README.md
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<!--info-header-start--><h1>IndexOf <img src="https://img.shields.io/badge/-medium-d9901a" alt="medium"/> <img src="https://img.shields.io/badge/-%23array-999" alt="#array"/></h1><blockquote><p>by Pineapple <a href="https://github.com/Pineapple0919" target="_blank">@Pineapple0919</a></p></blockquote><p><a href="https://tsch.js.org/5153/play" target="_blank"><img src="https://img.shields.io/badge/-Take%20the%20Challenge-3178c6?logo=typescript&logoColor=white" alt="Take the Challenge"/></a> </p><!--info-header-end-->

Implement the type version of Array.indexOf, indexOf<T, U> takes an Array T, any U and returns the index of the first U in Array T.

```ts
type Res = IndexOf<[1, 2, 3], 2>; // excepted to be 1
type Res1 = IndexOf<[2,6, 3,8,4,1,7, 3,9], 3>; // excepted to be 2
type Res2 = IndexOf<[0, 0, 0], 2>; // excepted to be -1
```


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