@taktikorg/error-ut-nesciunt NPM | npm.io

2.1.10 • Published 5 days ago

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License

MIT

Repository

Last release

5 days ago

@taktikorg/error-ut-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('@taktikorg/error-ut-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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typed array getopt https ES2017 map es5 code points stateless phone names curl util.inspect toobject validation limited shim uuid assign values hasOwn promise sequence react-hooks postcss starter array ecmascript 0 censor pipe polyfill moment ECMAScript 2022 debug flag uninstall StyleSheet parser prototype ansi ReactiveExtensions colour valid slot date limit linewrap elasticache typesafe colors create figlet trimRight in performant tostringtag codes negative pretty art Array.prototype.contains ES matches request nodejs string airbnb function.length hasOwnProperty private syntax matchAll spring react WebSocket Streams term indicator has minimal WeakMap eslint ECMAScript 3 setter WeakSet source map dependency manager argv es6 readablestream ECMAScript 2017 eslint-plugin route ES2015 typedarray Push route53 react-testing-library last collection.es6 own es-shim API Int32Array channel iteration TypedArray flags callbind internal slot chai awesomesauce redirect find pnpm9 scheme positive cmd 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