README.md

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none

Test whether all elements in a collection are falsy.

Usage

import none from 'https://cdn.jsdelivr.net/gh/stdlib-js/utils-none@deno/mod.js';

The previous example will load the latest bundled code from the deno branch. Alternatively, you may load a specific version by loading the file from one of the tagged bundles. For example,

import none from 'https://cdn.jsdelivr.net/gh/stdlib-js/utils-none@v0.2.2-deno/mod.js';

none( collection )

Tests whether all elements in a collection are falsy.

var arr = [ 0, 0, 0, 0, 0 ];

var bool = none( arr );
// returns true

If provided an empty collection, the function returns true.

var bool = none( [] );
// returns true

Notes

• A collection may be either an Array, Typed Array, or an array-like Object (excluding strings and functions).
• The function does not skip undefined elements and is thus not optimized for sparse collections.

Examples

import randu from 'https://cdn.jsdelivr.net/gh/stdlib-js/random-base-randu@deno/mod.js';
import none from 'https://cdn.jsdelivr.net/gh/stdlib-js/utils-none@deno/mod.js';

var bool;
var arr;
var i;

arr = new Array( 100 );
for ( i = 0; i < arr.length; i++ ) {
    arr[ i ] = ( randu() > 0.95 );
}

bool = none( arr );
// returns <boolean>

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See Also

• @stdlib/utils-any: test whether at least one element in a collection is truthy.
• @stdlib/utils-every: test whether all elements in a collection are truthy.
• @stdlib/utils-for-each: invoke a function for each element in a collection.
• @stdlib/utils-none-by: test whether all elements in a collection fail a test implemented by a predicate function.
• @stdlib/utils-some: test whether a collection contains at least n elements which are truthy.

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Notice

This package is part of stdlib, a standard library 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.

Community

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License

See LICENSE.

Copyright

Copyright © 2016-2024. The Stdlib Authors.