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29 lines
787 B
29 lines
787 B
4 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 return the index of the first occurence of a value
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- `lastIndexOf` that return the index of the last occurence of a value
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- `includes` that return 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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> `indexOf` and `lastIndexOf` takes an additionnal `fromIndex` argument
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> that allow you to begin searching from a specific index.
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### Notions
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- https://devdocs.io/javascript/global_objects/array/indexof
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- https://devdocs.io/javascript/global_objects/array/lastindexof
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- https://devdocs.io/javascript/global_objects/array/includes
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### Code provided
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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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