# @stdlib/assert-is-between-array

0.1.0 • Public • Published

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# isBetweenArray

Test if a value is an array-like object where every element is between two values.

## Installation

npm install @stdlib/assert-is-between-array

## Usage

var isBetweenArray = require( '@stdlib/assert-is-between-array' );

#### isBetweenArray( value, a, b[, left, right] )

Tests if a value is an array-like object where every element is between two values a (left comparison value) and b (right comparison value).

var arr = [ 3, 4, 5 ];

var bool = isBetweenArray( arr, 3, 5 );
// returns true

bool = isBetweenArray( arr, 4, 5 );
// returns false

bool = isBetweenArray( arr, 3, 4 );
// returns false

By default, the function assumes that a and b are inclusive.

var arr = [ 3, 4, 5 ];

var bool = isBetweenArray( arr, 3, 5 );
// returns true

bool = isBetweenArray( arr, 3, 5, 'closed', 'closed' );
// returns true

To make a and/or b exclusive, set the respective arguments to 'open'.

var arr = [ 3, 4, 5 ];

var bool = isBetweenArray( arr, 3, 5, 'open', 'closed' );
// returns false

bool = isBetweenArray( arr, 3, 5, 'closed', 'open' );
// returns false

## Notes

• If a and b are inclusive, the element-wise comparison is equivalent to

a <= v_i <= b

• If a is exclusive and b is inclusive, the element-wise comparison is equivalent to

a < v_i <= b

• If a is inclusive and b is exclusive, the element-wise comparison is equivalent to

a <= v_i < b

• If a and b are exclusive, the element-wise comparison is equivalent to

a < v_i < b

• If provided an empty array-like object, the function returns false.

var bool = isBetweenArray( [], 0.0, 1.0 );
// returns false
• If provided non-numeric values, element-wise comparisons are performed according to lexicographic order.

## Examples

var randu = require( '@stdlib/random-base-randu' );
var filledarrayBy = require( '@stdlib/array-filled-by' );
var isBetweenArray = require( '@stdlib/assert-is-between-array' );

// Create an array of random numbers:
var x = filledarrayBy( 100, 'float64', randu );

// Check whether every element resides within the interval [0.01, 0.99]:
var bool = isBetweenArray( x, 0.01, 0.99 );
console.log( bool );

## Notice

This package is part of stdlib, a standard library for JavaScript and Node.js, with an emphasis on numerical and scientific computing. The library provides a collection of robust, high performance libraries for mathematics, statistics, streams, utilities, and more.

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

## Package Sidebar

### Install

npm i @stdlib/assert-is-between-array

### Repository

github.com/stdlib-js/assert-is-between-array

stdlib.io

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