37 lines
884 B
V
37 lines
884 B
V
module datatypes
|
|
|
|
pub struct Stack<T> {
|
|
mut:
|
|
elements []T
|
|
}
|
|
|
|
// is_empty checks if the stack is empty
|
|
pub fn (stack Stack<T>) is_empty() bool {
|
|
return stack.elements.len == 0
|
|
}
|
|
|
|
// len returns the length of the stack
|
|
pub fn (stack Stack<T>) len() int {
|
|
return stack.elements.len
|
|
}
|
|
|
|
// peek returns the top of the stack
|
|
pub fn (stack Stack<T>) peek() ?T {
|
|
return if !stack.is_empty() { stack.elements.last() } else { error('Stack is empty') }
|
|
}
|
|
|
|
// push adds an element to the top of the stack
|
|
pub fn (mut stack Stack<T>) push(item T) {
|
|
stack.elements << item
|
|
}
|
|
|
|
// pop removes the element at the top of the stack and returns it
|
|
pub fn (mut stack Stack<T>) pop() ?T {
|
|
return if !stack.is_empty() { stack.elements.pop() } else { error('Stack is empty') }
|
|
}
|
|
|
|
// str returns a string representation of the stack
|
|
pub fn (stack Stack<T>) str() string {
|
|
return stack.elements.str()
|
|
}
|