which-typed-array

Which kind of Typed Array is this JavaScript value? Works cross-realm, without instanceof, and despite Symbol.toStringTag.

Example

1var whichTypedArray = require('which-typed-array');
2var assert = require('assert');
3
4assert.equal(false, whichTypedArray(undefined));
5assert.equal(false, whichTypedArray(null));
6assert.equal(false, whichTypedArray(false));
7assert.equal(false, whichTypedArray(true));
8assert.equal(false, whichTypedArray([]));
9assert.equal(false, whichTypedArray({}));
10assert.equal(false, whichTypedArray(/a/g));
11assert.equal(false, whichTypedArray(new RegExp('a', 'g')));
12assert.equal(false, whichTypedArray(new Date()));
13assert.equal(false, whichTypedArray(42));
14assert.equal(false, whichTypedArray(NaN));
15assert.equal(false, whichTypedArray(Infinity));
16assert.equal(false, whichTypedArray(new Number(42)));
17assert.equal(false, whichTypedArray('foo'));
18assert.equal(false, whichTypedArray(Object('foo')));
19assert.equal(false, whichTypedArray(function () {}));
20assert.equal(false, whichTypedArray(function* () {}));
21assert.equal(false, whichTypedArray(x => x * x));
22assert.equal(false, whichTypedArray([]));
23
24assert.equal('Int8Array', whichTypedArray(new Int8Array()));
25assert.equal('Uint8Array', whichTypedArray(new Uint8Array()));
26assert.equal('Uint8ClampedArray', whichTypedArray(new Uint8ClampedArray()));
27assert.equal('Int16Array', whichTypedArray(new Int16Array()));
28assert.equal('Uint16Array', whichTypedArray(new Uint16Array()));
29assert.equal('Int32Array', whichTypedArray(new Int32Array()));
30assert.equal('Uint32Array', whichTypedArray(new Uint32Array()));
31assert.equal('Float32Array', whichTypedArray(new Float32Array()));
32assert.equal('Float64Array', whichTypedArray(new Float64Array()));
33assert.equal('BigInt64Array', whichTypedArray(new BigInt64Array()));
34assert.equal('BigUint64Array', whichTypedArray(new BigUint64Array()));

Tests

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