which-collection
Advanced tools
Changelog
v1.0.2 - 2024-03-08
a5b2949283ec03bf576dbnode/install instead of node/run; use codecov action 24968a2eslint, @ljharb/eslint-config, object-inspect, safe-publish-latest, tape f60b277nyc on all tests 5700269eslint, @ljharb/eslint-config, aud, auto-changelog, object-inspect, tape eb1f1a4cd5b8fceslint, @ljharb/eslint-config, aud, auto-changelog, object-inspect, tape f5786fa7ac7b67b074105eslint, @ljharb/eslint-config, aud, auto-changelog, object-inspect, tape ec640d665d842ef106289@ljharb/eslint-config, aud, npmignore, object-inspect, tape e784a1fnpmignore to autogenerate an npmignore file 95b503f121ba2dis-map, is-set, is-weakmap, is-weakset 4aa150f2afaed7is-map, is-set ce44763pull_request_target event b16b664auto-changelog, tape 2b9c953engines.node dcdbfdeauto-changelog; add aud 8e7f28dsideEffects flag 3e0376bis-weakset 7b3e9223339feaReadme
Which kind of Collection (Map, Set, WeakMap, WeakSet) is this JavaScript value? Works cross-realm, without instanceof, and despite Symbol.toStringTag.
var whichCollection = require('which-collection');
var assert = 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(new RegExp('a', 'g')));
assert.equal(false, whichCollection(new Date()));
assert.equal(false, whichCollection(42));
assert.equal(false, whichCollection(NaN));
assert.equal(false, whichCollection(Infinity));
assert.equal(false, whichCollection(new Number(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(new Map()));
assert.equal('Set', whichCollection(new Set()));
assert.equal('WeakMap', whichCollection(new WeakMap()));
assert.equal('WeakSet', whichCollection(new WeakSet()));
Simply clone the repo, npm install, and run npm test
FAQs
Which kind of Collection (Map, Set, WeakMap, WeakSet) is this JavaScript value? Works cross-realm, without `instanceof`, and despite Symbol.toStringTag.
The npm package which-collection receives a total of 12,961,317 weekly downloads. As such, which-collection popularity was classified as popular.
We found that which-collection demonstrated a healthy version release cadence and project activity because the last version was released less than a year ago. It has 1 open source maintainer collaborating on the project.
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