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| // STACK
function Stack() {
var items = [];
this.push = function() {
items.push.apply(items, arguments);
};
this.pop = function() {
return items.pop.apply(items, arguments);
};
this.size = function() {
return items.length;
};
this.peek = function() {
return items;
};
this.isEmpty = function() {
return items.length === 0;
};
}
// STACK TESTS
var stack = new Stack();
stack.push(1, 2, 3, 4, 5);
console.log(stack.peek()); // [ 1, 2, 3, 4, 5 ]
stack.pop();
console.log(stack.peek()); // [ 1, 2, 3, 4 ]
// QUEUE
function Queue() {
var inbox = new Stack();
var outbox = new Stack();
this.eneque = function() {
inbox.push.apply(inbox, arguments);
};
this.dequeue = function() {
if (outbox.size() === 0) {
while (inbox.size())
outbox.push(inbox.pop());
}
return outbox.pop();
};
this.size = function(){
return inbox.size() + outbox.size();
};
this.peek = function() {
return outbox.peek();
};
this.isEmpty = function() {
return inbox.length + outbox.length === 0;
};
this.front = function() {
if (outbox.size() === 0) {
while (inbox.size())
outbox.push(inbox.pop());
}
return outbox.peek()[0];
};
}
// QUEUE TESTS
var queue = new Queue();
console.log(queue.size()); // 0
queue.eneque(10, 20, 30, 40, 50, 60);
console.log(queue.size()); // 6
console.log(queue.peek()); // [] Not move to outbox yet
console.log(queue.dequeue()); // 10
console.log(queue.dequeue()); // 20
console.log(queue.peek()); // [ 60, 50, 40, 30 ]
console.log(queue.front()); // 60
console.log(queue.size()); // 4
console.log(queue.dequeue()); // 30
console.log(queue.dequeue()); // 40
console.log(queue.peek()); // [ 60, 50 ]
|
