Instanceof

Checks if variable is instance of some constructor.
Also can detect any type with Instanceof.getType()

Usage:

const Instanceof = require( 'instanceof' );
 
// Instanceof( {mixed}, {Array|mixed} ) => Boolean
 
Instanceof( 123, Number );                                  // true
Instanceof( 123, [ Number, Array, String, 'Boolean' ] );    // true
Instanceof( [], [ Number, Array ] );                        // true
Instanceof( [], 'Array' );                                  // true
Instanceof( NaN, NaN );                                     // true
Instanceof( Object, Function );                             // true
 
Instanceof( '123', Number );                                // false
Instanceof( Object, Object );                               // false
Instanceof( Object, [ Object, 'NaN', 'Null', null ] );      // false
Instanceof( 123, [ Object, 'NaN', 'Null', null, 'null' ] ); // false
 
// --- GetType ---
 
Instanceof.getType( NaN );									// 'NaN'
Instanceof.getType( { a: 123 } );							// 'object'
Instanceof.getType( [ 1, 2, 3 ] );							// 'array'
Instanceof.getType( null );									// 'null'