peek
Returns the first item in this deque if it is not empty, otherwise returns the given value.
Example
val deque = dequeOf(1)
assert(deque.peekFirstOr(6) == 1)
deque.clear()
assert(deque.peekFirstOr(6) == 6)Content copied to clipboard
Return
Either the first item in this deque if this deque is non-empty, or value if this deque is empty.
Parameters
value
Alternative or default value to return when this deque is empty.