Testando clase queue

Author: nillswe

examples/charpter05/queue.js

@@ -0,0 +1,15 @@
+const Queue = require('../../src/js/data-structures/queue')
+
+const queue = new Queue()
+
+queue.enqueue('Carlos')
+queue.enqueue('joana')
+queue.enqueue('Maria')
+
+console.log('Peek', queue.peek())
+queue.dequeue()
+console.log('Peek', queue.peek())
+console.log('Size', queue.size())
+queue.clear()
+console.log('Size', queue.size())
+console.log('IsEmpty?', queue.isEmpty())

src/js/data-structures/queue.js

@@ -1,17 +1,17 @@
 class Queue {
  constructor() {
- this.count = 0
- this.lowestCount = 0
- this.items = {}
+ this._count = 0
+ this._lowestCount = 0
+ this._items = {}
  }
 
  /**
  * Adiciona elemento na fila
  * @param {*} element
  */
  enqueue(element) {
- this.items[this.count] = element
- this.count++
+ this._items[this._count] = element
+ this._count++
  }
 
  /**
@@ -20,8 +20,8 @@ class Queue {
  */
  dequeue() {
  if (this.isEmpty()) return undefined
- const result = this.items[this.lowestCount]
- this.lowestCount++
+ const result = this._items[this._lowestCount]
+ this._lowestCount++
  return result
  }
 
@@ -30,14 +30,14 @@ class Queue {
  */
  peek() {
  if (this.isEmpty()) return undefined
- return this.items[this.lowestCount]
+ return this._items[this._lowestCount]
  }
 
  /**
  * @returns {int} retorna tamanho da fila
  */
  size() {
- return this.count - this.lowestCount
+ return this._count - this._lowestCount
  }
 
  /**
@@ -52,16 +52,16 @@ class Queue {
  * Limpa a fila
  */
  clear() {
- this.items = {}
- this.count = 0
- this.lowestCount = 0
+ this._items = {}
+ this._count = 0
+ this._lowestCount = 0
  }
 
  toString() {
  if (this.isEmpty()) return ''
- let objString = `${this.items[this.lowestCount]}`
- for (let i = this.lowestCount + 1; i < this.count(); i++) {
- objString += `${objString}, ${this.items[i]}`
+ let objString = `${this._items[this._lowestCount]}`
+ for (let i = this._lowestCount + 1; i < this._count(); i++) {
+ objString += `${objString}, ${this._items[i]}`
  }
 
  return objString