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Changed queue #47

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Merged
christianbender merged 2 commits into from
Mar 30, 2018
Merged

Changed queue #47

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5ec422e
more objectoriented
Mar 30, 2018
4d6735e
put in comments
Mar 30, 2018
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41 changes: 25 additions & 16 deletions Data Structures/Queue/Queue.js
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Original file line number Diff line number Diff line change
Expand Up @@ -7,43 +7,52 @@

//Functions: enqueue, dequeue, peek, view, length

var Queue = function() {
var Queue = (function () {

//This is the array representation of the queue
this.queue = [];
// constructor
function Queue() {

//This is the array representation of the queue
this.queue = [];

}

// methods
//Add a value to the end of the queue
this.enqueue = function(item) {
Queue.prototype.enqueue = function (item) {
this.queue[this.queue.length] = item;
}
};

//Removes the value at the front of the queue
this.dequeue = function() {
Queue.prototype.dequeue = function () {
if (this.queue.length === 0) {
return "Queue is Empty";
throw "Queue is Empty";
}

var result = this.queue[0];
this.queue.splice(0, 1); //remove the item at position 0 from the array

return result;
}
};

//Return the length of the queue
this.length = function() {
Queue.prototype.length = function () {
return this.queue.length;
}
};

//Return the item at the front of the queue
this.peek = function() {
Queue.prototype.peek = function () {
return this.queue[0];
}
};

//List all the items in the queue
this.view = function() {
Queue.prototype.view = function () {
console.log(this.queue);
}
}
};

return Queue;

}());

//Implementation
var myQueue = new Queue();
Expand Down Expand Up @@ -72,4 +81,4 @@ for (var i = 0; i < 5; i++) {
myQueue.view();
}

console.log(myQueue.dequeue());
//console.log(myQueue.dequeue()); // throws exception!