Stacks And Queues
Stack Operations
Visualize LIFO behavior with push, pop, and peek operations before moving into parentheses parsing and monotonic stack patterns.
O(1) per operation
LIFO: last in, first outoperation: pop
Top
value48
value36
value24
value12
Base
Time
O(1) per pop
Space
O(n)
Step Note
Start with a filled stack. Pop always removes the current top.
function popAll(stack: number[]) {
while (stack.length > 0) {
const top = stack[stack.length - 1]
stack.pop()
}
return stack
}