Three tiny programs, paused mid-run. Step through them line by line and watch the
call stack build up and peel back off — every frame carrying its own copy of the values.
step 0 / 0
step
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stack depth over time
step
0 / 0
frames on stack
1
calls made
0
result
running…
source
▸ current line · n frames paused hereline 1
call stack
1 frame
space play/pause · ←→ step ·
homeend jump · 123 pick a program