https://github.com/stdlib-js/object-some-in-by
Test whether an object contains at least n properties (own and inherited) which pass a test implemented by a predicate function.
https://github.com/stdlib-js/object-some-in-by
all any collection every inherited iterate javascript node node-js nodejs own predicate property some stdlib test util utilities utility utils
Last synced: 6 months ago
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Test whether an object contains at least n properties (own and inherited) which pass a test implemented by a predicate function.
- Host: GitHub
- URL: https://github.com/stdlib-js/object-some-in-by
- Owner: stdlib-js
- License: apache-2.0
- Created: 2025-06-26T03:40:57.000Z (7 months ago)
- Default Branch: main
- Last Pushed: 2025-07-07T00:33:49.000Z (6 months ago)
- Last Synced: 2025-07-07T01:34:09.445Z (6 months ago)
- Topics: all, any, collection, every, inherited, iterate, javascript, node, node-js, nodejs, own, predicate, property, some, stdlib, test, util, utilities, utility, utils
- Language: JavaScript
- Homepage: https://github.com/stdlib-js/stdlib
- Size: 239 KB
- Stars: 0
- Watchers: 0
- Forks: 0
- Open Issues: 0
-
Metadata Files:
- Readme: README.md
- Changelog: CHANGELOG.md
- Contributing: CONTRIBUTING.md
- License: LICENSE
- Code of conduct: CODE_OF_CONDUCT.md
- Citation: CITATION.cff
- Security: SECURITY.md
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README
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# someInBy
[![NPM version][npm-image]][npm-url] [![Build Status][test-image]][test-url] [![Coverage Status][coverage-image]][coverage-url]
> Test whether an object contains at least `n` properties which pass a test implemented by a predicate function.
## Installation
```bash
npm install @stdlib/object-some-in-by
```
Alternatively,
- To load the package in a website via a `script` tag without installation and bundlers, use the [ES Module][es-module] available on the [`esm`][esm-url] branch (see [README][esm-readme]).
- If you are using Deno, visit the [`deno`][deno-url] branch (see [README][deno-readme] for usage intructions).
- For use in Observable, or in browser/node environments, use the [Universal Module Definition (UMD)][umd] build available on the [`umd`][umd-url] branch (see [README][umd-readme]).
The [branches.md][branches-url] file summarizes the available branches and displays a diagram illustrating their relationships.
To view installation and usage instructions specific to each branch build, be sure to explicitly navigate to the respective README files on each branch, as linked to above.
## Usage
```javascript
var someInBy = require( '@stdlib/object-some-in-by' );
```
#### someInBy( obj, n, predicate\[, thisArg ] )
Tests whether an `obj` contains at least `n` properties which pass a test implemented by a `predicate` function.
```javascript
function isNegative( value ) {
return ( value < 0 );
}
var obj = {
'a': 1,
'b': -2,
'c': 3,
'd': -1
};
var bool = someInBy( obj, 2, isNegative );
// returns true
```
Once the function finds `n` successful properties, the function **immediately** returns `true`.
```javascript
function isPositive( value ) {
if ( value < 0 ) {
throw new Error( 'should never reach this line' );
}
return ( value > 0 );
}
var obj = {
'a': 1,
'b': 2,
'c': -3,
'd': 4
};
var bool = someInBy( obj, 2, isPositive );
// returns true
```
The invoked `function` is provided three arguments:
- **value**: object property value.
- **key**: object property key.
- **obj**: input object.
To set the function execution context, provide a `thisArg`.
```javascript
function sum( value ) {
this.sum += value;
this.count += 1;
return ( value < 0 );
}
var obj = {
'a': 1,
'b': 2,
'c': 3,
'd': -5
};
var context = {
'sum': 0,
'count': 0
};
var bool = someInBy( obj, 1, sum, context );
// returns true
var mean = context.sum / context.count;
// returns 0.25
```
## Notes
- If provided an empty `obj`, the function returns `false`.
```javascript
function alwaysTrue() {
return true;
}
var bool = someInBy( {}, 1, alwaysTrue );
// returns false
```
- The function does **not** skip `undefined` properties.
```javascript
function log( value, key ) {
console.log( '%s: %s', key, value );
return ( value < 0 );
}
var obj = {
'a': 1,
'b': void 0,
'c': void 0,
'd': 4,
'e': -1
};
var bool = someInBy( obj, 1, log );
// logs
// a: 1
// b: void 0
// c: void 0
// d: 4
// e: -1
```
- The function provides limited support for dynamic objects (i.e., objects whose properties change during execution).
## Examples
```javascript
var randu = require( '@stdlib/random-base-randu' );
var someInBy = require( '@stdlib/object-some-in-by' );
function threshold( value ) {
return ( value > 0.95 );
}
var bool;
var obj = {};
var i;
for ( i = 0; i < 100; i++ ) {
obj[ 'key' + i ] = randu();
}
bool = someInBy( obj, 5, threshold );
// returns
```
* * *
## See Also
- [`@stdlib/utils-any-in-by`][@stdlib/utils/any-in-by]: test whether at least one property in an object passes a test implemented by a predicate function.
- [`@stdlib/object-every-in-by`][@stdlib/object/every-in-by]: test whether all properties (own and inherited) of an object pass a test implemented by a predicate function.
- [`@stdlib/utils-some-by`][@stdlib/utils/some-by]: test whether a collection contains at least `n` elements which pass a test implemented by a predicate function.
- [`@stdlib/utils-some-own-by`][@stdlib/utils/some-own-by]: test whether some `own` properties of a provided object satisfy a predicate function for at least `n` properties.
* * *
## Notice
This package is part of [stdlib][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][stdlib], see the main project [repository][stdlib].
#### Community
[![Chat][chat-image]][chat-url]
---
## License
See [LICENSE][stdlib-license].
## Copyright
Copyright © 2016-2025. The Stdlib [Authors][stdlib-authors].
[npm-image]: http://img.shields.io/npm/v/@stdlib/object-some-in-by.svg
[npm-url]: https://npmjs.org/package/@stdlib/object-some-in-by
[test-image]: https://github.com/stdlib-js/object-some-in-by/actions/workflows/test.yml/badge.svg?branch=main
[test-url]: https://github.com/stdlib-js/object-some-in-by/actions/workflows/test.yml?query=branch:main
[coverage-image]: https://img.shields.io/codecov/c/github/stdlib-js/object-some-in-by/main.svg
[coverage-url]: https://codecov.io/github/stdlib-js/object-some-in-by?branch=main
[chat-image]: https://img.shields.io/gitter/room/stdlib-js/stdlib.svg
[chat-url]: https://app.gitter.im/#/room/#stdlib-js_stdlib:gitter.im
[stdlib]: https://github.com/stdlib-js/stdlib
[stdlib-authors]: https://github.com/stdlib-js/stdlib/graphs/contributors
[umd]: https://github.com/umdjs/umd
[es-module]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Modules
[deno-url]: https://github.com/stdlib-js/object-some-in-by/tree/deno
[deno-readme]: https://github.com/stdlib-js/object-some-in-by/blob/deno/README.md
[umd-url]: https://github.com/stdlib-js/object-some-in-by/tree/umd
[umd-readme]: https://github.com/stdlib-js/object-some-in-by/blob/umd/README.md
[esm-url]: https://github.com/stdlib-js/object-some-in-by/tree/esm
[esm-readme]: https://github.com/stdlib-js/object-some-in-by/blob/esm/README.md
[branches-url]: https://github.com/stdlib-js/object-some-in-by/blob/main/branches.md
[stdlib-license]: https://raw.githubusercontent.com/stdlib-js/object-some-in-by/main/LICENSE
[@stdlib/utils/any-in-by]: https://github.com/stdlib-js/utils-any-in-by
[@stdlib/object/every-in-by]: https://github.com/stdlib-js/object-every-in-by
[@stdlib/utils/some-by]: https://github.com/stdlib-js/utils-some-by
[@stdlib/utils/some-own-by]: https://github.com/stdlib-js/utils-some-own-by