Escrevendo método toString() e realizando testes com a estrtura de dados Deque

Author: nillswe

examples/charpter05/deque.js

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+const Deque = require('../../src/js/data-structures/deque')
+
+const deque = new Deque()
+deque.addFront('Nilton')
+deque.addFront('João')
+deque.addFront('Maria')
+
+console.log('Front:', deque.peekFront())
+console.log('size:', deque.size())
+
+console.log('Back', deque.peekBack())
+console.log('IsEmpty', deque.isEmpty())
+
+console.log('String:', deque.toString())
+console.log('IsEmpty', deque.isEmpty())