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`copyWithin(array, ~target, ~start, ~end)` copies the sequence of array elements within the array to the position starting at `target`. The copy is taken from the index positions `start` to `end`.
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Beware this will *mutate* the array.
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See [`Array.copyWithin`](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/copyWithin) on MDN.
`indexOf(array, item)` returns the index of the provided `item` in `array`. Uses [strict check for equality](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Strict_equality) when comparing items.
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`indexOf(array, item, ~from)` returns the index of the provided `item` in `array`, starting the search at `from`. Uses [strict check for equality](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Strict_equality) when comparing items.
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Returns `-1` if the item doesn not exist. Check out `Array.indexOfOpt` for a version that returns `None` instead of `-1` if the item does not exist.
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Returns `-1` if the item isn't found. Check out `Array.indexOfOpt` for a version that returns `None` instead of `-1` if the item does not exist.
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See [`Array.indexOf`](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/indexOf) on MDN.
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@@ -427,12 +450,13 @@ See [`Array.indexOf`](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Re
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```rescript
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[1, 2]->Array.indexOf(2) == 1
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[1, 2]->Array.indexOf(3) == -1
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[1, 2, 1, 2]->Array.indexOf(2, ~from=2) == 3
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[{"language": "ReScript"}]->Array.indexOf({"language": "ReScript"}) == -1 // -1, because of strict equality
`indexOfOpt(array, item)` returns an option of the index of the provided `item` in `array`. Uses [strict check for equality](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Strict_equality) when comparing items.
@@ -448,7 +472,8 @@ See [`Array.indexOf`](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Re
`join(array, separator)` produces a string where all items of `array` are printed, separated by `separator`. Array items must be strings, to join number or other arrays, use `joinUnsafe`. Under the hood this will run JavaScript's `toString` on all the array items.
`lastIndexOf(array, item, ~from)` returns the last index of the provided `item` in `array`, searching backwards from `from`. Uses [strict check for equality](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Strict_equality) when comparing items.
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Returns `-1` if the item isn't found. Check out `Array.lastIndexOfOpt` for a version that returns `None` instead of `-1` if the item does not exist.
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See [`Array.lastIndexOf`](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/lastIndexOf) on MDN.
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## Examples
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```rescript
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[1, 2, 1, 2]->Array.lastIndexOf(2) == 3
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[1, 2]->Array.lastIndexOf(3) == -1
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[1, 2, 1, 2]->Array.lastIndexOf(2, ~from=2) == 1
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[{"language": "ReScript"}]->Array.lastIndexOf({"language": "ReScript"}) == -1 // -1, because of strict equality
/** `fromBuffer` creates a `BigInt64Array` from an `ArrayBuffer.t`. See [TypedArray constructor on MDN](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/BigInt64Array/BigInt64Array)
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**Note:** This is a potentially unsafe operation. Ensure the buffer is large enough and only accessed within its bounds.
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**Note:** This is a potentially unsafe operation. Ensure the buffer is large enough and only accessed within its bounds.
/** `fromBufferToEnd` creates a `BigInt64Array` from an `ArrayBuffer.t`, starting at a particular offset and continuing through to the end. See [TypedArray constructor on MDN](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/BigInt64Array/BigInt64Array)
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**Note:** This is a potentially unsafe operation. Ensure the buffer is large enough and only accessed within its bounds.
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**Note:** This is a potentially unsafe operation. Ensure the buffer is large enough and only accessed within its bounds.
/** `fromBufferWithRange` creates a `BigInt64Array` from an `ArrayBuffer.t`, starting at a particular offset and consuming `length` **bytes**. See [TypedArray constructor on MDN](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/BigInt64Array/BigInt64Array)
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**Note:** This is a potentially unsafe operation. Ensure the buffer is large enough and only accessed within its bounds.
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**Note:** This is a potentially unsafe operation. Ensure the buffer is large enough and only accessed within its bounds.
/** `fromLength` creates a zero-initialized `BigInt64Array` to hold the specified count of numbers; this is **not** a byte length. See [TypedArray constructor on MDN](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/BigInt64Array/BigInt64Array)
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**Note:** This is a potentially unsafe operation. Ensure the buffer is large enough and only accessed within its bounds.
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**Note:** This is a potentially unsafe operation. Ensure the buffer is large enough and only accessed within its bounds.
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*/
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@new
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externalfromLength: int=>t="BigInt64Array"
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/** `fromArrayLikeOrIterable` creates a `BigInt64Array` from an array-like or iterable object. See [TypedArray.from on MDN](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/TypedArray/from)
/** `fromArrayLikeOrIterableWithMap` creates a `BigInt64Array` from an array-like or iterable object and applies the mapping function to each item. The mapping function expects (value, index). See [TypedArray.from on MDN](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/TypedArray/from)
/** `fromBuffer` creates a `BigUint64Array` from an `ArrayBuffer.t`. See [TypedArray constructor on MDN](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/BigUint64Array/BigUint64Array)
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**Note:** This is a potentially unsafe operation. Ensure the buffer is large enough and only accessed within its bounds.
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**Note:** This is a potentially unsafe operation. Ensure the buffer is large enough and only accessed within its bounds.
/** `fromBufferToEnd` creates a `BigUint64Array` from an `ArrayBuffer.t`, starting at a particular offset and continuing through to the end. See [TypedArray constructor on MDN](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/BigUint64Array/BigUint64Array)
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**Note:** This is a potentially unsafe operation. Ensure the buffer is large enough and only accessed within its bounds.
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**Note:** This is a potentially unsafe operation. Ensure the buffer is large enough and only accessed within its bounds.
/** `fromBufferWithRange` creates a `BigUint64Array` from an `ArrayBuffer.t`, starting at a particular offset and consuming `length` **bytes**. See [TypedArray constructor on MDN](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/BigUint64Array/BigUint64Array)
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**Note:** This is a potentially unsafe operation. Ensure the buffer is large enough and only accessed within its bounds.
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**Note:** This is a potentially unsafe operation. Ensure the buffer is large enough and only accessed within its bounds.
/** `fromLength` creates a zero-initialized `BigUint64Array` to hold the specified count of numbers; this is **not** a byte length. See [TypedArray constructor on MDN](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/BigUint64Array/BigUint64Array)
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**Note:** This is a potentially unsafe operation. Ensure the buffer is large enough and only accessed within its bounds.
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**Note:** This is a potentially unsafe operation. Ensure the buffer is large enough and only accessed within its bounds.
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*/
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@new
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externalfromLength: int=>t="BigUint64Array"
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/** `fromArrayLikeOrIterable` creates a `BigUint64Array` from an array-like or iterable object. See [TypedArray.from on MDN](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/TypedArray/from)
/** `fromArrayLikeOrIterableWithMap` creates a `BigUint64Array` from an array-like or iterable object and applies the mapping function to each item. The mapping function expects (value, index). See [TypedArray.from on MDN](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/TypedArray/from)
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