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# typedarray

> Create a typed array.

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<section class="intro">

</section>

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<section class="usage">

## Usage

```javascript
var typedarray = require( '@stdlib/array/typed' );
```

#### typedarray( \[dtype] )

Creates a [typed array][mdn-typed-array] having a specified [data type][@stdlib/array/typed-dtypes].

```javascript
var arr = typedarray();
// returns <Float64Array>
```

By default, the output [typed array][mdn-typed-array] data type is `float64`. To specify an alternative data type, provide a [`dtype`][@stdlib/array/typed-dtypes] argument.

```javascript
var arr = typedarray( 'int32' );
// returns <Int32Array>
```

#### typedarray( length\[, dtype] )

Returns a [typed array][mdn-typed-array] having a specified `length`.

```javascript
var arr1 = typedarray( 5 );
// returns <Float64Array>[ 0.0, 0.0, 0.0, 0.0, 0.0 ]

var arr2 = typedarray( 5, 'uint8' );
// returns <Uint8Array>[ 0, 0, 0, 0, 0 ]
```

#### typedarray( typedarray\[, dtype] )

Creates a [typed array][mdn-typed-array] from another [typed array][mdn-typed-array].

```javascript
var arr1 = typedarray( [ 5.0, -3.0, 2.0 ] );
// returns <Float64Array>[ 5.0, -3.0, 2.0 ]

var arr2 = typedarray( arr1 );
// returns <Float64Array>[ 5.0, -3.0, 2.0 ]

var arr3 = typedarray( arr1, 'int32' );
// returns <Int32Array>[ 5, -3, 2 ]
```

#### typedarray( obj\[, dtype] )

Creates a [typed array][mdn-typed-array] from an array-like object or iterable.

```javascript
var arr1 = typedarray( [ 0.5, 0.5, 0.5 ] );
// returns <Float64Array>[ 0.5, 0.5, 0.5 ]

var arr2 = typedarray( [ 0.5, 0.5, 0.5 ], 'float32' );
// returns <Float32Array>[ 0.5, 0.5, 0.5 ]
```

If [`dtype`][@stdlib/array/typed-dtypes] is complex number data type and an array-like object contains interleaved real and imaginary components, the array-like object must have a length which is a multiple of two.

#### typedarray( buffer\[, byteOffset\[, length]]\[, dtype] )

Returns a [typed array][mdn-typed-array] view of an [`ArrayBuffer`][mdn-arraybuffer].

```javascript
var ArrayBuffer = require( '@stdlib/array/buffer' );
var buf = new ArrayBuffer( 32 );

var arr1 = typedarray( buf );
// returns <Float64Array>[ 0.0, 0.0, 0.0, 0.0 ]

var arr2 = typedarray( buf, 'float32' );
// returns <Float32Array>[ 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0 ]

var arr3 = typedarray( buf, 16 );
// returns <Float64Array>[ 0.0, 0.0 ]

var arr4 = typedarray( buf, 16, 'float32' );
// returns <Float32Array>[ 0.0, 0.0, 0.0, 0.0 ]

var arr5 = typedarray( buf, 16, 1 );
// returns <Float64Array>[ 0.0 ]

var arr6 = typedarray( buf, 10, 4, 'int16' );
// returns <Int16Array>[ 0, 0, 0, 0 ]
```

</section>

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<section class="notes">

## Notes

-   When providing a complex number array, if [`dtype`][@stdlib/array/typed-dtypes] is unspecified or the specified data type is not a complex number data type, the returned array contains interleaved real and imaginary components.

</section>

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<section class="examples">

## Examples

<!-- eslint no-undef: "error" -->

```javascript
var randu = require( '@stdlib/random/base/randu' );
var typedarray = require( '@stdlib/array/typed' );

var arr = typedarray( 100, 'float64' );

var i;
for ( i = 0; i < arr.length; i++ ) {
    arr[ i ] = randu() * 100.0;
}
console.log( arr );
```

</section>

<!-- /.examples -->

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</section>

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* * *

## See Also

-   <span class="package-name">[`@stdlib/array/complex128`][@stdlib/array/complex128]</span><span class="delimiter">: </span><span class="description">Complex128Array.</span>
-   <span class="package-name">[`@stdlib/array/complex64`][@stdlib/array/complex64]</span><span class="delimiter">: </span><span class="description">Complex64Array.</span>
-   <span class="package-name">[`@stdlib/array/float64`][@stdlib/array/float64]</span><span class="delimiter">: </span><span class="description">Float64Array.</span>
-   <span class="package-name">[`@stdlib/array/float32`][@stdlib/array/float32]</span><span class="delimiter">: </span><span class="description">Float32Array.</span>
-   <span class="package-name">[`@stdlib/array/int32`][@stdlib/array/int32]</span><span class="delimiter">: </span><span class="description">Int32Array.</span>
-   <span class="package-name">[`@stdlib/array/uint32`][@stdlib/array/uint32]</span><span class="delimiter">: </span><span class="description">Uint32Array.</span>
-   <span class="package-name">[`@stdlib/array/int16`][@stdlib/array/int16]</span><span class="delimiter">: </span><span class="description">Int16Array.</span>
-   <span class="package-name">[`@stdlib/array/uint16`][@stdlib/array/uint16]</span><span class="delimiter">: </span><span class="description">Uint16Array.</span>
-   <span class="package-name">[`@stdlib/array/int8`][@stdlib/array/int8]</span><span class="delimiter">: </span><span class="description">Int8Array.</span>
-   <span class="package-name">[`@stdlib/array/uint8`][@stdlib/array/uint8]</span><span class="delimiter">: </span><span class="description">Uint8Array.</span>
-   <span class="package-name">[`@stdlib/array/uint8c`][@stdlib/array/uint8c]</span><span class="delimiter">: </span><span class="description">Uint8ClampedArray.</span>

</section>

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<section class="links">

[mdn-typed-array]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/TypedArray

[mdn-arraybuffer]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/ArrayBuffer

[@stdlib/array/typed-dtypes]: https://github.com/stdlib-js/array/tree/main/typed-dtypes

<!-- <related-links> -->

[@stdlib/array/complex128]: https://github.com/stdlib-js/array/tree/main/complex128

[@stdlib/array/complex64]: https://github.com/stdlib-js/array/tree/main/complex64

[@stdlib/array/float64]: https://github.com/stdlib-js/array/tree/main/float64

[@stdlib/array/float32]: https://github.com/stdlib-js/array/tree/main/float32

[@stdlib/array/int32]: https://github.com/stdlib-js/array/tree/main/int32

[@stdlib/array/uint32]: https://github.com/stdlib-js/array/tree/main/uint32

[@stdlib/array/int16]: https://github.com/stdlib-js/array/tree/main/int16

[@stdlib/array/uint16]: https://github.com/stdlib-js/array/tree/main/uint16

[@stdlib/array/int8]: https://github.com/stdlib-js/array/tree/main/int8

[@stdlib/array/uint8]: https://github.com/stdlib-js/array/tree/main/uint8

[@stdlib/array/uint8c]: https://github.com/stdlib-js/array/tree/main/uint8c

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</section>

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