4 lines
		
	
	
		
			73 B
		
	
	
	
		
			JavaScript
		
	
	
	
	
	
		
		
			
		
	
	
			4 lines
		
	
	
		
			73 B
		
	
	
	
		
			JavaScript
		
	
	
	
	
	
|  | module.exports = Number.isNaN || function isNaN(a) { | ||
|  | 	return a !== a; | ||
|  | }; |