// Trying to dequeue past the write pointer should return null and does not advance the write pointer.
it is not dequeuing past the write pointer
class CircularQueue {
constructor(size) {
this.queue = [];
this.read = 0;
this.write = 0;
this.max = size - 1;
while (size > 0) {
this.queue.push(null);
size--;
}
}
print() {
return this.queue;
}
enqueue(item) {
// Only change code below this line
let q=this.queue
let w=this.write
if(q[w]===null){
let temp=q[w]
q[w]=item
this.write=(this.write+1)%(this.max+1)
return temp
}
return null
// Only change code above this line
}
dequeue() {
// Only change code below this line
let q=this.queue
let r=this.read
if(q[r]!==null){
let temp=q[r]
q[r]=null
this.read=(this.read+1)%(this.max+1)
return temp
}
console.log('returned null')
return null
// Only change code above this line
}
}
let q=new CircularQueue(4)
q.enqueue('a')
q.enqueue('b')
q.enqueue('c')
q.enqueue('d')
q.dequeue()
q.dequeue()
q.dequeue()
q.dequeue()
q.dequeue()
q.dequeue()
q.dequeue()
q.enqueue('e')
q.dequeue()
console.log(q.print())
it is not dequeuing past the write pointer.
ive dequeued a bunch of times past the last write and its returning null as the challenge is asking. then I enqued string ‘e’ and then dequed and its behaving as expected. if it was moving past it as its claiming its doing than it would not deque that ‘e’ because it would have advanced to a later position.