Halaman utama Jelajahi Bantuan
Daftar Masuk
lhl
/
zyAdmin
1
0
Fork 0
Berkas Masalah 0 Permintaan Tarik 0 Wiki
Pohon: 90dc2ad543
Ranting Tag
zyAdmin
/
node_modules
/
which-boxed-primitive
lhl 2bdf874dbb create 11 bulan lalu
..
.github 2bdf874dbb create 11 bulan lalu
test 2bdf874dbb create 11 bulan lalu
.editorconfig 2bdf874dbb create 11 bulan lalu
.eslintrc 2bdf874dbb create 11 bulan lalu
.nycrc 2bdf874dbb create 11 bulan lalu
CHANGELOG.md 2bdf874dbb create 11 bulan lalu
LICENSE 2bdf874dbb create 11 bulan lalu
README.md 2bdf874dbb create 11 bulan lalu
index.d.ts 2bdf874dbb create 11 bulan lalu
index.js 2bdf874dbb create 11 bulan lalu
package.json 2bdf874dbb create 11 bulan lalu
tsconfig.json 2bdf874dbb create 11 bulan lalu

README.md

which-boxed-primitive Version Badge

dependency status dev dependency status License Downloads

npm badge

Which kind of boxed JS primitive is this? This module works cross-realm/iframe, does not depend on instanceof or mutable properties, and works despite ES6 Symbol.toStringTag.

Example

var whichBoxedPrimitive = require('which-boxed-primitive');
var assert = require('assert');

// unboxed primitives return `null`
// boxed primitives return the builtin constructor name

assert.equal(whichBoxedPrimitive(undefined), null);
assert.equal(whichBoxedPrimitive(null), null);

assert.equal(whichBoxedPrimitive(false), null);
assert.equal(whichBoxedPrimitive(true), null);
assert.equal(whichBoxedPrimitive(new Boolean(false)), 'Boolean');
assert.equal(whichBoxedPrimitive(new Boolean(true)), 'Boolean');

assert.equal(whichBoxedPrimitive(42), null);
assert.equal(whichBoxedPrimitive(NaN), null);
assert.equal(whichBoxedPrimitive(Infinity), null);
assert.equal(whichBoxedPrimitive(new Number(42)), 'Number');
assert.equal(whichBoxedPrimitive(new Number(NaN)), 'Number');
assert.equal(whichBoxedPrimitive(new Number(Infinity)), 'Number');

assert.equal(whichBoxedPrimitive(''), null);
assert.equal(whichBoxedPrimitive('foo'), null);
assert.equal(whichBoxedPrimitive(new String('')), 'String');
assert.equal(whichBoxedPrimitive(new String('foo')), 'String');

assert.equal(whichBoxedPrimitive(Symbol()), null);
assert.equal(whichBoxedPrimitive(Object(Symbol()), 'Symbol');

assert.equal(whichBoxedPrimitive(42n), null);
assert.equal(whichBoxedPrimitive(Object(42n), 'BigInt');

// non-boxed-primitive objects return `undefined`
assert.equal(whichBoxedPrimitive([]), undefined);
assert.equal(whichBoxedPrimitive({}), undefined);
assert.equal(whichBoxedPrimitive(/a/g), undefined);
assert.equal(whichBoxedPrimitive(new RegExp('a', 'g')), undefined);
assert.equal(whichBoxedPrimitive(new Date()), undefined);
assert.equal(whichBoxedPrimitive(function () {}), undefined);
assert.equal(whichBoxedPrimitive(function* () {}), undefined);
assert.equal(whichBoxedPrimitive(x => x * x), undefined);
assert.equal(whichBoxedPrimitive([]), undefined);

Tests

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