Delete List Nodes

Given the head of a linked list and a value, remove all nodes containing the value.

  var prev = head
  var cur = head?.next
  
  while cur != nil {
    while cur != nil && cur?.value == value {
      cur = cur?.next
    }
    
    prev?.next = cur
    prev = cur
    cur = cur?.next
  }
  
  if head?.value == value {
    head = head?.next
  }