JavaScript preprocessors can help make authoring JavaScript easier and more convenient. For instance, CoffeeScript can help prevent easy-to-make mistakes and offer a cleaner syntax and Babel can bring ECMAScript 6 features to browsers that only support ECMAScript 5.
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s in order, and run before the JavaScript in the editor. You can use the URL of any other Pen and it will include the JavaScript from that Pen.
You can apply a script from anywhere on the web to your Pen. Just put a URL to it here and we'll add it, in the order you have them, before the JavaScript in the Pen itself.
If the script you link to has the file extension of a preprocessor, we'll attempt to process it before applying.
You can also link to another Pen here, and we'll pull the JavaScript from that Pen and include it. If it's using a matching preprocessor, we'll combine the code before preprocessing, so you can use the linked Pen as a true dependency.
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/*
Queue.js
A function to represent a queue
Created by Kate Morley - http://code.iamkate.com/ - and released under the terms
of the CC0 1.0 Universal legal code:
http://creativecommons.org/publicdomain/zero/1.0/legalcode
*/
/* Creates a new queue. A queue is a first-in-first-out (FIFO) data structure -
* items are added to the end of the queue and removed from the front.
*/
function Queue(){
// initialise the queue and offset
var queue = [];
var offset = 0;
// Returns the the queue.
this.get = function(){
return queue;
}
// Returns the length of the queue.
this.getLength = function(){
return (queue.length - offset);
}
// Returns true if the queue is empty, and false otherwise.
this.isEmpty = function(){
return (queue.length == 0);
}
/* Enqueues the specified item. The parameter is:
*
* item - the item to enqueue
*/
this.enqueue = function(item){
queue.push(item);
}
/* Dequeues an item and returns it. If the queue is empty, the value
* 'undefined' is returned.
*/
this.dequeue = function(){
// if the queue is empty, return immediately
if (queue.length == 0) return undefined;
// store the item at the front of the queue
var item = queue[offset];
// increment the offset and remove the free space if necessary
if (++ offset * 2 >= queue.length){
queue = queue.slice(offset);
offset = 0;
}
// return the dequeued item
return item;
}
/* Returns the item at the front of the queue (without dequeuing it). If the
* queue is empty then undefined is returned.
*/
this.peek = function(){
return (queue.length > 0 ? queue[offset] : undefined);
}
}
// create a new queue
var queue = new Queue();
// enqueue an item
queue.enqueue('item1');
queue.enqueue('item2');
queue.enqueue('item3');
queue.enqueue('item4');
console.log(queue.getLength());
console.log(queue.get());
// dequeue an item
var item = queue.dequeue();
console.log(queue.getLength());
console.log(queue.get());
Also see: Tab Triggers