get or set example

gistfile1.txt

var levelup = require('levelup');

var db = levelup('./mydb', {cacheSize: 0});

function getOrSet(num){
  if( num == 0 ) return;

	var hash = num.toString();
	
	db.get(hash, function(err,result){
		if( err ){
			db.put(hash, num, function(){
				return getOrSet(--num);				
			});
			return;
		}
		return getOrSet(--num);	
	});
}

getOrSet(500000);