npm package: @stdlib/array-base-assert
Description: Base array assertion utilities.
Author: The Stdlib Authors
Latest version: 0.4.1

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# assert

[![NPM version][npm-image]][npm-url] [![Build Status][test-image]][test-url] [![Coverage Status][coverage-image]][coverage-url] <!-- [![dependencies][dependencies-image]][dependencies-url] -->

> Base array assertion utilities.

<section class="installation">

## Installation

```bash
npm install @stdlib/array-base-assert
```

</section>

<section class="usage">

## Usage

```javascript
var ns = require( '@stdlib/array-base-assert' );
```

#### ns

Assertion utilities.

```javascript
var o = ns;
// returns {...}
```

The namespace exports the following:

<!-- <toc pattern="*"> -->

<div class="namespace-toc">

-   <span class="signature">[`contains( x, value )`][@stdlib/array/base/assert/contains]</span><span class="delimiter">: </span><span class="description">test if an array contains a provided search value.</span>
-   <span class="signature">[`hasAlmostEqualValues( x, y, maxULP )`][@stdlib/array/base/assert/has-almost-equal-values]</span><span class="delimiter">: </span><span class="description">test if two arrays have respective elements which are approximately equal within a specified number of ULPs (units in the last place).</span>
-   <span class="signature">[`hasAlmostSameValues( x, y, maxULP )`][@stdlib/array/base/assert/has-almost-same-values]</span><span class="delimiter">: </span><span class="description">test if two arrays have respective elements which are approximately the same value within a specified number of ULPs (units in the last place).</span>
-   <span class="signature">[`hasEqualValuesIndexed( x, y )`][@stdlib/array/base/assert/has-equal-values-indexed]</span><span class="delimiter">: </span><span class="description">test if two indexed arrays have equal values.</span>
-   <span class="signature">[`hasEqualValues( x, y )`][@stdlib/array/base/assert/has-equal-values]</span><span class="delimiter">: </span><span class="description">test if two arrays have equal values.</span>
-   <span class="signature">[`hasSameValues( x, y )`][@stdlib/array/base/assert/has-same-values]</span><span class="delimiter">: </span><span class="description">test if two arrays have the same values.</span>
-   <span class="signature">[`isAccessorArray( value )`][@stdlib/array/base/assert/is-accessor-array]</span><span class="delimiter">: </span><span class="description">test if an array-like object supports the accessor (get/set) protocol.</span>
-   <span class="signature">[`isBooleanDataType( value )`][@stdlib/array/base/assert/is-boolean-data-type]</span><span class="delimiter">: </span><span class="description">test if an input value is a supported array boolean data type.</span>
-   <span class="signature">[`isBooleanArray( value )`][@stdlib/array/base/assert/is-booleanarray]</span><span class="delimiter">: </span><span class="description">test if a value is a `BooleanArray`.</span>
-   <span class="signature">[`isByteOrder( value )`][@stdlib/array/base/assert/is-byte-order]</span><span class="delimiter">: </span><span class="description">test if an input value is a supported array byte order.</span>
-   <span class="signature">[`isComplexFloatingPointDataType( value )`][@stdlib/array/base/assert/is-complex-floating-point-data-type]</span><span class="delimiter">: </span><span class="description">test if an input value is a supported array complex-valued floating-point data type.</span>
-   <span class="signature">[`isComplexTypedArray( value )`][@stdlib/array/base/assert/is-complex-typed-array]</span><span class="delimiter">: </span><span class="description">test if a value is a complex typed array.</span>
-   <span class="signature">[`isComplex128Array( value )`][@stdlib/array/base/assert/is-complex128array]</span><span class="delimiter">: </span><span class="description">test if a value is a `Complex128Array`.</span>
-   <span class="signature">[`isComplex64Array( value )`][@stdlib/array/base/assert/is-complex64array]</span><span class="delimiter">: </span><span class="description">test if a value is a `Complex64Array`.</span>
-   <span class="signature">[`isDataType( value )`][@stdlib/array/base/assert/is-data-type]</span><span class="delimiter">: </span><span class="description">test if an input value is a supported array data type.</span>
-   <span class="signature">[`isFloatingPointDataType( value )`][@stdlib/array/base/assert/is-floating-point-data-type]</span><span class="delimiter">: </span><span class="description">test if an input value is a supported array floating-point data type.</span>
-   <span class="signature">[`isIntegerDataType( value )`][@stdlib/array/base/assert/is-integer-data-type]</span><span class="delimiter">: </span><span class="description">test if an input value is a supported array integer data type.</span>
-   <span class="signature">[`isMostlySafeDataTypeCast( from, to )`][@stdlib/array/base/assert/is-mostly-safe-data-type-cast]</span><span class="delimiter">: </span><span class="description">determine whether an array data type can be safely cast or, for floating-point data types, downcast to another array data type.</span>
-   <span class="signature">[`isNumericDataType( value )`][@stdlib/array/base/assert/is-numeric-data-type]</span><span class="delimiter">: </span><span class="description">test if an input value is a supported array numeric data type.</span>
-   <span class="signature">[`isRealDataType( value )`][@stdlib/array/base/assert/is-real-data-type]</span><span class="delimiter">: </span><span class="description">test if an input value is a supported array real-valued data type.</span>
-   <span class="signature">[`isRealFloatingPointDataType( value )`][@stdlib/array/base/assert/is-real-floating-point-data-type]</span><span class="delimiter">: </span><span class="description">test if an input value is a supported array real-valued floating-point data type.</span>
-   <span class="signature">[`isSafeDataTypeCast( from, to )`][@stdlib/array/base/assert/is-safe-data-type-cast]</span><span class="delimiter">: </span><span class="description">determine whether an array data type can be safely cast to another array data type.</span>
-   <span class="signature">[`isSameKindDataTypeCast( from, to )`][@stdlib/array/base/assert/is-same-kind-data-type-cast]</span><span class="delimiter">: </span><span class="description">determine whether an array data type can be safely cast to, or is of the same "kind" as, another array data type.</span>
-   <span class="signature">[`isSignedIntegerDataType( value )`][@stdlib/array/base/assert/is-signed-integer-data-type]</span><span class="delimiter">: </span><span class="description">test if an input value is a supported array signed integer data type.</span>
-   <span class="signature">[`isSortedAscending( x )`][@stdlib/array/base/assert/is-sorted-ascending]</span><span class="delimiter">: </span><span class="description">test if an array is sorted in ascending order.</span>
-   <span class="signature">[`isUnsignedIntegerDataType( value )`][@stdlib/array/base/assert/is-unsigned-integer-data-type]</span><span class="delimiter">: </span><span class="description">test if an input value is a supported array unsigned integer data type.</span>

</div>

<!-- </toc> -->

</section>

<!-- /.usage -->

<section class="examples">

## Examples

<!-- TODO: better examples -->

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

```javascript
var ns = require( '@stdlib/array-base-assert' );
var dtype = require( '@stdlib/array-dtype' );
var Float64Array = require( '@stdlib/array-float64' );
var Int32Array = require( '@stdlib/array-int32' );
var Uint8Array = require( '@stdlib/array-uint8' );
var Complex128Array = require( '@stdlib/array-complex128' );

// Create various arrays:
var arr1 = new Float64Array( [ 1.1, 2.2, 3.3 ] );
var arr2 = new Int32Array( [ 1, 2, 3 ] );
var arr3 = new Uint8Array( [ 1, 2, 3 ] );
var arr4 = new Complex128Array( [ 1.0, 1.0, 2.0, 2.0 ] ); // two complex numbers: 1+1i, 2+2i

// Get data types:
var dt1 = dtype( arr1 );
var dt2 = dtype( arr2 );
var dt3 = dtype( arr3 );
var dt4 = dtype( arr4 );

// Check data types:
console.log( dt1 + ' is floating-point data type: ' + ns.isFloatingPointDataType( dt1 ) );
// => 'float64 is floating-point data type: true'

console.log( dt2 + ' is integer data type: ' + ns.isIntegerDataType( dt2 ) );
// => 'int32 is integer data type: true'

console.log( dt3 + ' is unsigned integer data type: ' + ns.isUnsignedIntegerDataType( dt3 ) );
// => 'uint8 is unsigned integer data type: true'

console.log( dt4 + ' is complex floating-point data type: ' + ns.isComplexFloatingPointDataType( dt4 ) );
// => 'complex128 is complex floating-point data type: true'

// Check if arrays have the same values:
console.log( 'arr2 and arr3 have same values: ' + ns.hasSameValues( arr2, arr3 ) );
// => 'arr2 and arr3 have same values: true'

console.log( 'arr1 and arr2 have same values: ' + ns.hasSameValues( arr1, arr2 ) );
// => 'arr1 and arr2 have same values: false'

// Check safe data type casts:
console.log( 'Can safely cast from ' + dt2 + ' to ' + dt1 + ': ' + ns.isSafeDataTypeCast( dt2, dt1 ) );
// => 'Can safely cast from int32 to float64: true'

console.log( 'Can safely cast from ' + dt1 + ' to ' + dt2 + ': ' + ns.isSafeDataTypeCast( dt1, dt2 ) );
// => 'Can safely cast from float64 to int32: false'

console.log( 'Can safely cast from ' + dt3 + ' to ' + dt2 + ': ' + ns.isSafeDataTypeCast( dt3, dt2 ) );
// => 'Can safely cast from uint8 to int32: true'

console.log( 'Can safely cast from ' + dt4 + ' to ' + dt1 + ': ' + ns.isSafeDataTypeCast( dt4, dt1 ) );
// => 'Can safely cast from complex128 to float64: false'

// Check if arrays contain specific values:
console.log( 'arr1 contains 2.2: ' + ns.contains( arr1, 2.2 ) );
// => 'arr1 contains 2.2: true'

console.log( 'arr2 contains 2: ' + ns.contains( arr2, 2 ) );
// => 'arr2 contains 2: true'

console.log( 'arr2 contains 2.2: ' + ns.contains( arr2, 2.2 ) );
// => 'arr2 contains 2.2: false'

// Check complex array types:
console.log( 'arr4 is Complex128Array: ' + ns.isComplex128Array( arr4 ) );
// => 'arr4 is Complex128Array: true'

console.log( 'arr4 is complex typed array: ' + ns.isComplexTypedArray( arr4 ) );
// => 'arr4 is complex typed array: true'
```

</section>

<!-- /.examples -->

<!-- Section for related `stdlib` packages. Do not manually edit this section, as it is automatically populated. -->

<section class="related">

</section>

<!-- /.related -->

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<section class="main-repo" >

* * *

## Notice

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For more information on the project, filing bug reports and feature requests, and guidance on how to develop [stdlib][stdlib], see the main project [repository][stdlib].

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---

## License

See [LICENSE][stdlib-license].


## Copyright

Copyright &copy; 2016-2026. The Stdlib [Authors][stdlib-authors].

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