Galactic.is(...)

Simple, fast type detection. No dependancies. Vanilla JS.

Galactic.is(...) has a simple API:

Galactic.is(variable)
Galactic.is(variable, expected)

You can detect the type of a variable:

Galactic.is([]) === 'Array'
Galactic.is(Date.now()) === 'Date'
Galactic.is(document.createElement('span')) === 'HTMLSpanElement'
Galactic.is(new SomeConstructor()) === 'SomeConstructor'

Or ensure the input variable is of a specific type:

Galactic.is(new Array, Array) // returns true
Galactic.is(new Array, 'Array') // returns true
Galactic.is(new Array, 'array') // returns true

Galactic.is(...) order of operations:

Check #1 — 'custom-type'

Galactic.is.register('MyConstructor', 'MyConstructor') // 'strict-type' validation
Galactic.is.register('MyConstructor', /MyRegExp/) // regex
Galactic.is.register('MyConstructor', MyConstructor) // instanceof validation
Galactic.is.register('MyConstructor', function (arg) { // custom validator
	return doTestThatReturnsBoolean(arg);
})

There is one preset 'custom' type called 'arrayish':

Galactic.is(new Array, 'arrayish') // returns true
Galactic.is(new Uint16Array, 'arrayish') // returns true
Galactic.is(document.body.childNodes, 'arrayish') // returns true

Check #2 — 'base-type'

/* primitive-type */
'boolean' // matches typeof arg === 'boolean'
'number' // matches typeof arg === 'number'
'string' // matches typeof arg === 'string'

/* number-type */
'int' // matches integers excluding Infinity & NaN
'integer' // alias to 'int'
'finite' // matches numbers excluding Infinity & NaN
'float' // alias to 'finite'

/* object-type */
'date' // matches any arg that inherits Date prototype
'function' // matches any arg that inherits Function prototype
'array' // matches Array.isArray(arg);
'object' // matches typeof arg === 'object' // see 'strict-type' for specific object types
'element' // matches any arg that inherits *Element prototype

Check #3 — 'strict-type'

Matches the value of Object.prototype.toString.call(arg)

CamelCase & lowercase both work!

Here's some examples:

'ArrayBuffer' // or 'arraybuffer'
'Blob' // or 'blob'
'HTMLBodyElement' // or 'htmlbodyelement'
'Object' // does not have a lowercase equiv... as 'object' is a base-type!
'RegExp' // or 'regexp'
'Uint8Array' // or 'uint8array'