Movatterモバイル変換

[0]ホーム
URL:

Skip to content

Navigation Menu

Sign in
Appearance settings

Search code, repositories, users, issues, pull requests...

Provide feedback

We read every piece of feedback, and take your input very seriously.

Saved searches

Use saved searches to filter your results more quickly

 Sign up
Appearance settings

Which kind of Collection (Map, Set, WeakMap, WeakSet) is this JavaScript value? Works cross-realm, without `instanceof`, and despite Symbol.toStringTag.

License

NotificationsYou must be signed in to change notification settings

inspect-js/which-collection

github actionscoveragedependency statusdev dependency statusLicenseDownloads

npm badge

Which kind of Collection (Map, Set, WeakMap, WeakSet) is this JavaScript value? Works cross-realm, withoutinstanceof, and despite Symbol.toStringTag.

Example

varwhichCollection=require('which-collection');varassert=require('assert');assert.equal(false,whichCollection(undefined));assert.equal(false,whichCollection(null));assert.equal(false,whichCollection(false));assert.equal(false,whichCollection(true));assert.equal(false,whichCollection([]));assert.equal(false,whichCollection({}));assert.equal(false,whichCollection(/a/g));assert.equal(false,whichCollection(newRegExp('a','g')));assert.equal(false,whichCollection(newDate()));assert.equal(false,whichCollection(42));assert.equal(false,whichCollection(NaN));assert.equal(false,whichCollection(Infinity));assert.equal(false,whichCollection(newNumber(42)));assert.equal(false,whichCollection(42n));assert.equal(false,whichCollection(Object(42n)));assert.equal(false,whichCollection('foo'));assert.equal(false,whichCollection(Object('foo')));assert.equal(false,whichCollection(function(){}));assert.equal(false,whichCollection(function*(){}));assert.equal(false,whichCollection(x=>x*x));assert.equal(false,whichCollection([]));assert.equal('Map',whichCollection(newMap()));assert.equal('Set',whichCollection(newSet()));assert.equal('WeakMap',whichCollection(newWeakMap()));assert.equal('WeakSet',whichCollection(newWeakSet()));

Tests

Simply clone the repo,npm install, and runnpm test

About

Which kind of Collection (Map, Set, WeakMap, WeakSet) is this JavaScript value? Works cross-realm, without `instanceof`, and despite Symbol.toStringTag.

Topics

Resources

License

Code of conduct

Contributing

Security policy

Stars

Watchers

Forks

[8]ページ先頭
©2009-2025 Movatter.jp