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Gathering detailed insights and metrics for selectn

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Gathering detailed insights and metrics for selectn

selectn - 1.3.0 | npmpackage.info

selectn

Curried property accessor function that resolves deeply-nested object properties via dot/bracket-notation string path while mitigating TypeErrors via friendly and composable API.

1.3.0

197

MIT

JavaScript

735.00 B

2.5

Installations

npm install selectn

Developer Guide

BETA

Typescript

No

Module System

CommonJS

Node Version

23.9.0

NPM Version

10.9.2 Score

98.6

Supply Chain

100

Quality

76.3

Maintenance

100

Vulnerability

100

License

Pull Requests

Open

6

Total

64

Closed

16

Merged

42

Issues

Open

6

Total

33

Closed

27

Releases

Unable to fetch releases

Languages

JavaScript

JavaScript (100%)

Developer

wilmoore

Download Statistics

Total Downloads

Last Day

Last Week

Last Month

Last Year

GitHub Statistics

MIT License

197 Stars

243 Commits

16 Forks

4 Watchers

194 Branches

6 Contributors

Updated on Mar 02, 2025

Bundle Size

1.72 kB

Minified

735.00 B

Minified + Gzipped

Bundlephobia

Maintainers

View All 6 Contributors

Package Meta Information

Latest Version

1.3.0

Package Id

selectn@1.3.0

Unpacked Size

22.69 kB

Size

6.95 kB

File Count

NPM Version

10.9.2

Node Version

23.9.0

Published on

Mar 02, 2025

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

brackets2dots curry2 dotsplit.js

Dev Dependencies

browserify-standalone dependency-check fixpack istanbul nodemon standard tap-spec tape tape-catch uglify-js zuul

selectn

Curried property accessor function that resolves deeply-nested object properties via dot/bracket-notation string path while mitigating TypeErrors via friendly and composable API.

1yarn add selectn

1npm install selectn --save

1<script src="https://unpkg.com/selectn/selectn.min.js"></script>

You may also install selectn via Bower or jspm.

Overview

allows you to refactor this:

person && person.info && person.info.name && person.info.name.full

into:

selectn('info.name.full', person)

or refactor this:

contacts.map(function (contact) {
  return contact && contact.addresses && contact.addresses[0]
})

into:

contacts.map(selectn('addresses[0]')))

Demo

Features

Mitigate boilerplate guards like if (obj && obj.a && obj.a.b && obj.a.b.c).
Mitigate TypeError Cannot read property '...' of undefined.
Multiple levels of array nesting: 'group[0].section.a.seat[3]'.
Dashed key access: 'stats.temperature-today'.
When the value at the given path is a function, it is invoked and the functions returned value is returned.
selectn is auto-curried so partial application is automatic when you omit the second argument.
selectn uses Haskell style parameter order (AKA: data-last) which enables pointfree style programming.
Functions returned by selectn are higher-order property accessors which can be passed to other higher-order functions like map or filter.
Compatible with modern and legacy browsers, Node/CommonJS, and AMD.

Non-Features

No eval or Function (see: eval in disguise).
No typeof since, typeof is not a real solution to this problem but can appear to be due to the way the global scope is implied.

Usage example(s)

property accessor as predicate

Avoid annoying Cannot read property '...' of undefined TypeError without writing boilerplate anonymous functions or guards.

1var selectn = require('selectn')
2var language = [
3  { strings: { en: { name: 'english' } }},
4  { strings: { es: { name: 'spanish' } }},
5  { strings: { km: { name: 'khmer'   } }},
6  { strings: { es: { name: 'spanish' } }},
7  { nodatas: {}}
8]
9
10var spanish = selectn('strings.es')
11//=> [Function]
12
13language.filter(spanish).length
14//=> 2

point-free property accessor

Access deeply nested properties (including dashed properties) using point-free style.

1var selectn = require('selectn')
2var data = {
3  client: {
4    message: { 'message-id': 'd50afb80-a6be-11e2-9e96-0800200c9a66' }
5  }
6}
7
8var getId = selectn('client.message.message-id')
9//=> [Function]
10
11Promise.resolve(data).then(getId)
12//=> 'd50afb80-a6be-11e2-9e96-0800200c9a66'

property accessor for functor

Avoid wrapping property accessors in anonymous functions.

1var selectn = require('selectn')
2var contacts = [
3  { addresses: [ '123 Main St, Broomfield, CO 80020', '123 Main St, Denver, CO 80202' ] },
4  { addresses: [ '123 Main St, Kirkland, IL 60146' ] },
5  { phones: [] },
6]
7
8var primaryAddress = selectn('addresses[0]')
9//=> [Function]
10
11contacts.map(primaryAddress)
12//=> [ '123 Main St, Broomfield, CO 80020', '123 Main St, Kirkland, IL 60146', undefined ]

support for keys containing `.`

Pass an array as path instead of a string.

1var selectn = require('selectn')
2var data = {
3  client: {
4    'message.id': 'd50afb80-a6be-11e2-9e96-0800200c9a66'
5  }
6}
7
8selectn(['client', 'message.id'], data)
9//=> 'd50afb80-a6be-11e2-9e96-0800200c9a66'

value at path is a function

Avoid var fn = data.may.be.a.fn; if (typeof fn === 'function') fn().

1var selectn = require('selectn')
2function hi () { return 'hi' }
3var data = { may: { be: { a: { fn: hi } } } }
4
5selectn('may.be.a.fn', data)
6//=> 'hi'

API (partial application)

`selectn(String|Array)`

arguments

path (String|Array) Dot/bracket-notation string path or array.

returns

(Function) Unary function accepting the object to access.

API (full application)

`selectn(String|Array, Object)`

arguments

path (String|Array) Dot/bracket-notation string path or array.
object (String|Array) Object to access.

returns

(*|undefined) Value at path if path exists or undefined if path does not exist.

Other Languages

selectn has inspired ports to other languages:

Language	Project
Python	selectn

Other JS packages whose friendly API is driven by selectn:

Inspiration

JS packages that have inspired selectn:

Alternatives

Alternative packages you might like instead of selectn:

Licenses

No vulnerabilities found.

10

Binary-Artifacts

Determines if the project has generated executable (binary) artifacts in the source repository.

10

Dangerous-Workflow

Determines if the project's GitHub Action workflows avoid dangerous patterns.

10

License

Determines if the project has defined a license.

0

Code-Review

Determines if the project requires human code review before pull requests (aka merge requests) are merged.

0

Maintained

Determines if the project is "actively maintained".

0

Token-Permissions

Determines if the project's workflows follow the principle of least privilege.

0

Pinned-Dependencies

Determines if the project has declared and pinned the dependencies of its build process.

0

CII-Best-Practices

Determines if the project has an OpenSSF (formerly CII) Best Practices Badge.

0

Security-Policy

Determines if the project has published a security policy.

0

Fuzzing

Determines if the project uses fuzzing.

0

Branch-Protection

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

0

SAST

Determines if the project uses static code analysis.

0

Vulnerabilities

Determines if the project has open, known unfixed vulnerabilities.

Reason

73 existing vulnerabilities detected

Details

Warn: Project is vulnerable to: GHSA-pp7h-53gx-mx7r
Warn: Project is vulnerable to: GHSA-qwcr-r2fm-qrc7
Warn: Project is vulnerable to: GHSA-v6h2-p8h4-qcjw
Warn: Project is vulnerable to: GHSA-cwfw-4gq5-mrqx
Warn: Project is vulnerable to: GHSA-g95f-p29q-9xw4
Warn: Project is vulnerable to: GHSA-grv7-fg5c-xmjg
Warn: Project is vulnerable to: GHSA-rch9-xh7r-mqgw
Warn: Project is vulnerable to: GHSA-pxg6-pf52-xh8x
Warn: Project is vulnerable to: GHSA-92vm-wfm5-mxvv
Warn: Project is vulnerable to: GHSA-h452-7996-h45h
Warn: Project is vulnerable to: GHSA-9vvw-cc9w-f27h
Warn: Project is vulnerable to: GHSA-gxpj-cx7g-858c
Warn: Project is vulnerable to: GHSA-hr2v-3952-633q
Warn: Project is vulnerable to: GHSA-gpvr-g6gh-9mc2
Warn: Project is vulnerable to: GHSA-cm5g-3pgc-8rg4
Warn: Project is vulnerable to: GHSA-jj78-5fmv-mv28
Warn: Project is vulnerable to: GHSA-rv95-896h-c2vc
Warn: Project is vulnerable to: GHSA-qw6h-vgh9-j6wx
Warn: Project is vulnerable to: GHSA-9qj9-36jm-prpv
Warn: Project is vulnerable to: GHSA-q42p-pg8m-cqh6
Warn: Project is vulnerable to: GHSA-2cf5-4w76-r9qv
Warn: Project is vulnerable to: GHSA-3cqr-58rm-57f8
Warn: Project is vulnerable to: GHSA-g9r4-xpmj-mj65
Warn: Project is vulnerable to: GHSA-q2c6-c6pm-g3gh
Warn: Project is vulnerable to: GHSA-w457-6q6x-cgp9
Warn: Project is vulnerable to: GHSA-9prh-257w-9277
Warn: Project is vulnerable to: GHSA-765h-qjxv-5f44
Warn: Project is vulnerable to: GHSA-f2jv-r9rf-7988
Warn: Project is vulnerable to: GHSA-jcpv-g9rr-qxrc
Warn: Project is vulnerable to: GHSA-44pw-h2cw-w3vq
Warn: Project is vulnerable to: GHSA-7f5c-rpf4-86p8
Warn: Project is vulnerable to: GHSA-vfrc-7r7c-w9mx
Warn: Project is vulnerable to: GHSA-jp4x-w63m-7wgm
Warn: Project is vulnerable to: GHSA-c429-5p7v-vgjp
Warn: Project is vulnerable to: GHSA-6x33-pw7p-hmpq
Warn: Project is vulnerable to: GHSA-jf85-cpcp-j695
Warn: Project is vulnerable to: GHSA-fvqr-27wr-82fm
Warn: Project is vulnerable to: GHSA-4xc9-xhrj-v574
Warn: Project is vulnerable to: GHSA-x5rq-j2xg-h7qm
Warn: Project is vulnerable to: GHSA-29mw-wpgm-hmr9
Warn: Project is vulnerable to: GHSA-35jh-r3h4-6jhm
Warn: Project is vulnerable to: GHSA-p6mc-m468-83gw
Warn: Project is vulnerable to: GHSA-952p-6rrq-rcjv
Warn: Project is vulnerable to: GHSA-wrvr-8mpx-r7pp
Warn: Project is vulnerable to: GHSA-hxm2-r34f-qmc5
Warn: Project is vulnerable to: GHSA-f8q6-p94x-37v3
Warn: Project is vulnerable to: GHSA-vh95-rmgr-6w4m
Warn: Project is vulnerable to: GHSA-xvch-5gv4-984h
Warn: Project is vulnerable to: GHSA-3fx5-fwvr-xrjg
Warn: Project is vulnerable to: GHSA-w9mr-4mfr-499f
Warn: Project is vulnerable to: GHSA-7mc5-chhp-fmc3
Warn: Project is vulnerable to: GHSA-h7cp-r72f-jxh6
Warn: Project is vulnerable to: GHSA-v62p-rq8g-8h59
Warn: Project is vulnerable to: GHSA-f9cm-p3w6-xvr3
Warn: Project is vulnerable to: GHSA-jjv7-qpx3-h62q
Warn: Project is vulnerable to: GHSA-gqgv-6jq5-jjj9
Warn: Project is vulnerable to: GHSA-hrpp-h998-j3pp
Warn: Project is vulnerable to: GHSA-7xfp-9c55-5vqj
Warn: Project is vulnerable to: GHSA-p8p7-x288-28g6
Warn: Project is vulnerable to: GHSA-xwg4-93c6-3h42
Warn: Project is vulnerable to: GHSA-jgqf-hwc5-hh37
Warn: Project is vulnerable to: GHSA-m6fv-jmcg-4jfg
Warn: Project is vulnerable to: GHSA-qg8p-v9q4-gh34
Warn: Project is vulnerable to: GHSA-g4rg-993r-mgx7
Warn: Project is vulnerable to: GHSA-4rq4-32rv-6wp6
Warn: Project is vulnerable to: GHSA-64g7-mvw6-v9qj
Warn: Project is vulnerable to: GHSA-8225-6cvr-8pqp
Warn: Project is vulnerable to: GHSA-w5p7-h5w8-2hfq
Warn: Project is vulnerable to: GHSA-xc7v-wxcw-j472
Warn: Project is vulnerable to: GHSA-34r7-q49f-h37c
Warn: Project is vulnerable to: GHSA-c9f4-xj24-8jqx
Warn: Project is vulnerable to: GHSA-v2p6-4mp7-3r9v
Warn: Project is vulnerable to: GHSA-776f-qx25-q3cc

Score

2.5

/10

Last Scanned on 2025-06-23

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.

Learn More

Other packages similar to selectn

Other packages similar to selectn

selectn

Installations

Developer Guide

No

CommonJS

23.9.0

10.9.2

Score

Pull Requests

6

64

16

42

Issues

6

33

27

Releases

Unable to fetch releases

Languages

Developer

Download Statistics

GitHub Statistics

Bundle Size

1.72 kB

735.00 B

Maintainers

Package Meta Information

Total Downloads

NaN

Weekly Downloads

Monthly Downloads

Yearly Downloads

Dependencies

Dev Dependencies

selectn

Overview

allows you to refactor this:

into:

or refactor this:

into:

Demo

Features

Non-Features

Usage example(s)

property accessor as predicate

point-free property accessor

property accessor for functor

support for keys containing .

value at path is a function

API (partial application)

selectn(String|Array)

arguments

returns

API (full application)

selectn(String|Array, Object)

arguments

returns

Other Languages

Related

Inspiration

Alternatives

Licenses

10

10

10

0

0

0

0

0

0

0

0

0

0

2.5

/10

support for keys containing `.`

`selectn(String|Array)`

`selectn(String|Array, Object)`