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33 lines
1.1 KiB
33 lines
1.1 KiB
5 years ago
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## Index Of
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### Instructions
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Create 3 functions:
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- `indexOf` that returns the index of the first occurence of a value
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- `lastIndexOf` that returns the index of the last occurence of a value
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- `includes` that returns true if the value was found in the array
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> If a value is not found, the returned index is -1
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> functions should have an array element as first argument,
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> both `indexOf` and `lastIndexOf` take an additional `fromIndex` argument
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> that allows you to begin searching from a specific index.
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### Notions
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- [devdocs.io/javascript/global_objects/array/indexof](https://devdocs.io/javascript/global_objects/array/indexof)
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- [devdocs.io/javascript/global_objects/array/lastindexof](https://devdocs.io/javascript/global_objects/array/lastindexof)
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- [devdocs.io/javascript/global_objects/array/includes](https://devdocs.io/javascript/global_objects/array/includes)
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### Code provided
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> all code provided will be added to your solution and doesn't need to be submited.
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```js
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Array.prototype.indexOf = undefined
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Array.prototype.lastIndexOf = undefined
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Array.prototype.includes = undefined
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```
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