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@stdlib/utils-async-some-by-right

0.2.2

Test whether a collection contains at least `n` elements which pass a test implemented by a predicate function, iterating from right to left.

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Gathering detailed insights and metrics for @stdlib/utils-async-some-by

@stdlib/utils-async-some-by - 0.2.2 | npmpackage.info

@stdlib/utils-async-some-by

Test whether a collection contains `n` elements which pass a test implemented by a predicate function.

0.2.2

Apache-2.0

JavaScript

81.18 kB

4.2

Installations

npm install @stdlib/utils-async-some-by

Developer Guide

BETA

Typescript

Yes

Module System

CommonJS

Min. Node Version

>=0.10.0

Node Version

16.20.2

NPM Version

8.19.4 Pull Requests

Open

0

Total

0

Closed

0

Issues

Open

0

Total

0

Closed

0

Releases

Unable to fetch releases

Languages

JavaScript

JavaScript (100%)

Developer

stdlib-js

Download Statistics

Total Downloads

Last Day

Last Week

Last Month

Last Year

GitHub Statistics

Apache-2.0 License

1 Stars

70 Commits

3 Watchers

5 Branches

14 Contributors

Updated on Apr 07, 2025

Sponsor this package

https://opencollective.com/stdlib

Maintainers

View All 14 Contributors

Package Meta Information

Latest Version

0.2.2

Package Id

@stdlib/utils-async-some-by@0.2.2

Unpacked Size

81.18 kB

Size

15.88 kB

File Count

NPM Version

8.19.4

Node Version

16.20.2

Published on

Jul 28, 2024

Total Downloads

Cumulative downloads

Total Downloads

NaN

Last Day

NaN

Compared to previous day

Last Week

NaN

Compared to previous week

Last Month

NaN

Compared to previous month

Last Year

NaN

Compared to previous year

Weekly Downloads

Monthly Downloads

Yearly Downloads

Dependencies

@stdlib/assert-has-own-property @stdlib/assert-is-boolean @stdlib/assert-is-collection @stdlib/assert-is-function @stdlib/assert-is-plain-object @stdlib/assert-is-positive-integer @stdlib/constants-float64-pinf @stdlib/string-format @stdlib/utils-define-nonenumerable-read-only-property debug @stdlib/error-tools-fmtprodmsg

About stdlib...

We believe in a future in which the web is a preferred environment for numerical computation. To help realize this future, we've built stdlib. stdlib is a standard library, with an emphasis on numerical and scientific computation, written in JavaScript (and C) for execution in browsers and in Node.js.

The library is fully decomposable, being architected in such a way that you can swap out and mix and match APIs and functionality to cater to your exact preferences and use cases.

When you use stdlib, you can be absolutely certain that you are using the most thorough, rigorous, well-written, studied, documented, tested, measured, and high-quality code out there.

To join us in bringing numerical computing to the web, get started by checking us out on GitHub, and please consider financially supporting stdlib. We greatly appreciate your continued support!

someByAsync

Test whether a collection contains at least n elements which pass a test implemented by a predicate function.

Installation

1npm install @stdlib/utils-async-some-by

Usage

1var someByAsync = require( '@stdlib/utils-async-some-by' );

someByAsync( collection, n, [options,] predicate, done )

Tests whether a collection contains at least n elements which pass a test implemented by a predicate function.

1function predicate( value, next ) {
2    setTimeout( onTimeout, value );
3    function onTimeout() {
4        console.log( value );
5        /* =>
6            1000
7            2500
8            3000
9        */
10
11        next( null, false );
12    }
13}
14
15function done( error, bool ) {
16    if ( error ) {
17        throw error;
18    }
19    console.log( bool );
20    // => false
21}
22
23var arr = [ 3000, 2500, 1000 ];
24
25someByAsync( arr, 2, predicate, done );

The function immediately stops processing collection elements and returns true for the test result upon receiving n truthy predicate result values.

1function predicate( value, index, next ) {
2    setTimeout( onTimeout, value );
3    function onTimeout() {
4        if ( index === 1 ) {
5            return next( new Error( 'beep' ) );
6        }
7        next( null, true );
8    }
9}
10
11function done( error, bool ) {
12    if ( error ) {
13        throw error;
14    }
15    console.log( bool );
16    // => true
17}
18
19var arr = [ 3000, 2500, 1000 ];
20
21someByAsync( arr, 1, predicate, done );

The function accepts the following options:

limit: the maximum number of pending invocations at any one time. Default: infinity.
series: boolean indicating whether to sequentially invoke the predicate function for each collection element. If true, the function sets options.limit=1. Default: false.
thisArg: the execution context for predicate.

By default, all elements are processed concurrently, which means that the function does not guarantee completion order. To process each collection element sequentially, set the series option to true.

1function predicate( value, next ) {
2    setTimeout( onTimeout, value );
3    function onTimeout() {
4        console.log( value );
5        /* =>
6            3000
7            2500
8            1000
9        */
10
11        next( null, false );
12    }
13}
14
15function done( error, bool ) {
16    if ( error ) {
17        throw error;
18    }
19    console.log( bool );
20    // => false
21}
22
23var arr = [ 3000, 2500, 1000 ];
24
25var opts = {
26    'series': true
27};
28
29someByAsync( arr, 2, opts, predicate, done );

To limit the maximum number of pending function invocations, set the limit option.

1function predicate( value, next ) {
2    setTimeout( onTimeout, value );
3    function onTimeout() {
4        console.log( value );
5        /* =>
6            2500
7            3000
8            1000
9        */
10
11        next( null, false );
12    }
13}
14
15function done( error, bool ) {
16    if ( error ) {
17        throw error;
18    }
19    console.log( bool );
20    // => false
21}
22
23var arr = [ 3000, 2500, 1000 ];
24
25var opts = {
26    'limit': 2
27};
28
29someByAsync( arr, 2, opts, predicate, done );

To set the execution context of the predicate function, set the thisArg option.

1function predicate( value, next ) {
2    this.count += 1;
3    setTimeout( onTimeout, value );
4    function onTimeout() {
5        next( null, false );
6    }
7}
8
9var arr = [ 3000, 2500, 1000 ];
10
11var context = {
12    'count': 0
13};
14
15var opts = {
16    'thisArg': context
17};
18
19someByAsync( arr, 2, opts, predicate, done );
20
21function done( error, bool ) {
22    if ( error ) {
23        throw error;
24    }
25    console.log( bool );
26    // => false
27
28    console.log( context.count );
29    // => 3
30}

When invoked, the predicate function is provided a maximum of four arguments:

value: collection value.
index: collection index.
collection: the input collection.
next: a callback which should be called once the predicate function has finished processing a collection value.

The actual number of provided arguments depends on function length. If the predicate function accepts two arguments, the predicate function is provided value and next. If the predicate function accepts three arguments, the predicate function is provided value, index, and next. For every other predicate function signature, the predicate function is provided all four arguments.

1function predicate( value, i, collection, next ) {
2    console.log( 'collection: %s. %d: %d', collection.join( ',' ), i, value );
3    /* =>
4        collection: 3000,2500,1000. 0: 3000
5        collection: 3000,2500,1000. 1: 2500
6        collection: 3000,2500,1000. 2: 1000
7    */
8
9    setTimeout( onTimeout, value );
10    function onTimeout() {
11        console.log( value );
12        /* =>
13            1000
14            2500
15            3000
16        */
17
18        next( null, false );
19    }
20}
21
22function done( error, bool ) {
23    if ( error ) {
24        throw error;
25    }
26    console.log( bool );
27    // => false
28}
29
30var arr = [ 3000, 2500, 1000 ];
31
32someByAsync( arr, 2, predicate, done );

someByAsync.factory( [options,] predicate )

Returns a function which invokes a predicate function once for each element in a collection.

1function predicate( value, next ) {
2    setTimeout( onTimeout, value );
3    function onTimeout() {
4        console.log( value );
5        next( null, false );
6    }
7}
8
9function done( error, bool ) {
10    if ( error ) {
11        throw error;
12    }
13    console.log( bool );
14}
15
16var f = someByAsync.factory( predicate );
17
18var arr1 = [ 3000, 2500, 1000 ];
19
20f( arr1, 2, done );
21/* e.g., =>
22    1000
23    2500
24    3000
25    false
26*/
27
28var arr2 = [ 300, 250, 100 ];
29
30f( arr2, 2, done );
31/* e.g., =>
32    100
33    250
34    300
35    false
36*/

The function accepts the same options as someByAsync().

Notes

A collection may be either an Array, Typed Array, or an array-like Object (excluding strings and functions).
If a provided function calls the next callback with a truthy error argument, the function suspends execution and immediately calls the done callback for subsequent error handling.
The function does not support dynamic collection resizing.
The function does not skip undefined elements.
If provided an empty collection, the function calls the done callback with false as the test result.
Neither someByAsync nor the function returned by the factory method guarantee asynchronous execution. To guarantee asynchrony, wrap the done callback in a function which either executes at the end of the current stack (e.g., nextTick) or during a subsequent turn of the event loop (e.g., setImmediate, setTimeout).

Examples

1var resolve = require( 'path' ).resolve;
2var readFile = require( '@stdlib/fs-read-file' );
3var someByAsync = require( '@stdlib/utils-async-some-by' );
4
5var files = [
6    resolve( __dirname, 'package.json' ),
7    resolve( __dirname, 'README.md' )
8];
9
10function done( error, bool ) {
11    if ( error ) {
12        throw error;
13    }
14    if ( bool ) {
15        console.log( 'Successfully read some files.' );
16    } else {
17        console.log( 'Unable to read some files.' );
18    }
19}
20
21function predicate( file, next ) {
22    var opts = {
23        'encoding': 'utf8'
24    };
25    readFile( file, opts, onFile );
26
27    function onFile( error ) {
28        if ( error ) {
29            return next( null, false );
30        }
31        next( null, true );
32    }
33}
34
35someByAsync( files, 2, predicate, done );

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.

Community

License

See LICENSE.

Copyright

No vulnerabilities found.

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10

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9

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3

Pinned-Dependencies

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Reason

dependency not pinned by hash detected -- score normalized to 3

Details

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Warn: npmCommand not pinned by hash: .github/workflows/test_published_package.yml:93
Info: 33 out of 33 GitHub-owned GitHubAction dependencies pinned
Info: 19 out of 24 third-party GitHubAction dependencies pinned
Info: 0 out of 32 npmCommand dependencies pinned

0

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0

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0

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0

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Determines if the default and release branches are protected with GitHub's branch protection settings.

Score

4.2

/10

Last Scanned on 2025-06-30

The Open Source Security Foundation is a cross-industry collaboration to improve the security of open source software (OSS). The Scorecard provides security health metrics for open source projects.

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Other packages similar to @stdlib/utils-async-some-by

Other packages similar to @stdlib/utils-async-some-by

@stdlib/utils-async-some-by

Installations

Developer Guide

Yes

CommonJS

>=0.10.0

16.20.2

8.19.4

Pull Requests

0

0

0

Issues

0

0

0

Releases

Unable to fetch releases

Languages

Developer

Download Statistics

GitHub Statistics

Sponsor this package

Maintainers

Package Meta Information

Total Downloads

NaN

Weekly Downloads

Monthly Downloads

Yearly Downloads

Dependencies

someByAsync

Installation

Usage

someByAsync( collection, n, [options,] predicate, done )

someByAsync.factory( [options,] predicate )

Notes

Examples

See Also

Notice

Community

License

Copyright

10

10

10

10

9

3

0

0

0

0

0

0

0

4.2

/10