@micromint1npm/in-fugit-nesciunt NPM

@micromint1npm/in-fugit-nesciunt

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

Example

var whichCollection = require('@micromint1npm/in-fugit-nesciunt');
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()));

Tests

Simply clone the repo, npm install, and run npm test

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es2017 less react-testing-library guid rate exec ES5 minimal assertion id robust a11y packages fast-clone lru nodejs styleguide javascript drop module react inspect sqs deepclone core-js postcss ES2018 react-hooks storagegateway stringify hasOwnProperty setImmediate weakmap _.extend route coercible regex es8 shrinkwrap iterate watchFile names shell jasmine entries take ArrayBuffer.prototype.slice xterm dataview readable deterministic node byte define apollo trimStart watcher mocha make async dir queueMicrotask invariant string figlet deep-copy censor css-in-js omit utilities diff ECMAScript 2023 tty BigUint64Array configurable file system connect ArrayBuffer modules path TypeScript tslib toArray chrome less css clone fast-deep-copy ES8 RegExp.prototype.flags prop metadata east-asian-width password call-bind prototype ES2016 styling descriptor cors require vpc react-hook-form limit AsyncIterator ReactiveExtensions bdd ES2022 filter language parents regexp hardlinks look symbol rm getOwnPropertyDescriptor some assign own inference batch ast walk regular expressions open preprocessor classes qs Array.prototype.flatten Function.prototype.name arrays arraybuffer typed glacier

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1.0.0

1 year ago