Simple JavaScript foreach lib with delay / timeout

gistfile1.js

// author: Fernando Felix do Nascimento Junior
// License: The MIT License

// example
forEach({
	data: [1, 2, 3, 4, 5, 6],
	timeout: 5000,
	step_by: 2,
	callback: function (value) {
		console.log(value);
	}
});

function forEach(config){
			
	var ini = config.ini; // initial index
	var data = config.data; // the data to lookup
	var timeout = config.timeout; // timeout to call next index
	var step_by = config.step_by; // step to call timeout
	var callback = config.callback;
	
	if (typeof ini == 'undefined')
		ini = 0;
	
	var step = ini + step_by;
	
	if (step > data.length)
		step = data.length;
	
	for (var i = ini; i < step; i++){				
		callback(data[i]);
	}
		
	config.ini = step;
	
	if (step < data.length) {
		setTimeout(function(){
			forEach(config);
		}, timeout);
	}
	
}