Stack: Difference between revisions

=={{header|Diego}}==

Diego has a <code>stack</code> object and posit:

<lang diego>set_ns(rosettacode)_me();

add_stack({int},a)_values(1..4); // 1,2,3,4 (1 is first/bottom, 4 is last/top)

with_stack(a)_pop(); // 1,2,3

with_stack(a)_push()_v(5,6); // 1,2,3,5,6

add_var({int},b)_value(7);

with_stack(a)_push[b]; // 1,2,3,5,6,7

with_stack(a)_pluck()_at(2); // callee will return `with_stack(a)_err(pluck invalid with stack);`

me_msg()_stack(a)_top(); // "7"

me_msg()_stack(a)_last(); // "7"

me_msg()_stack(a)_peek(); // "7"

me_msg()_stack(a)_bottom(); // "1"

me_msg()_stack(a)_first(); // "1"

me_msg()_stack(a)_peer(); // "1"

me_msg()_stack(a)_isempty(); // "false"

with_stack(a)_empty();

with_stack(a)_msg()_isempty()_me(); // "true" (alternative syntax)

me_msg()_stack(a)_history()_all(); // returns th entire history of stack 'a' since its creation

reset_ns[];</lang>

<code>stack</code> is a derivative of <code>array</code>, so arrays can also be used as stacks.