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Keyboard Shortcuts

All shortcuts work while the viewer is focused on desktop.

Key Action
→ or l Step forward one line
← or h Step backward one line
Shift+→ or j Step over forward — advance without descending into function calls
Shift+← or k Step over backward
u Step out of current function, return to the caller

Click any line number to jump directly to the first step on that line.

Display toggles

Key Toggles
A Animation mode — progressively reveals code lines as you step forward. Lines not yet reached are dimmed.
E Variable panel — shows/hides the variable panel.
R Raw mode — shows the original source code instead of rendered markdown and images. Useful for copying code.
F Fullscreen — enters/exits fullscreen presentation mode.

Mobile

On mobile there are no keyboard shortcuts. Use:

  • Swipe left/right to step forward/backward
  • Bottom navigation bar for all step controls (forward, backward, step over, step out)
  • Variables bar — tap to expand/collapse the variable panel

Step over vs step forward

Step forward (→) enters every function call. If insert() calls _find_parent(), you'll step through _find_parent line by line.

Step over (Shift+→) treats the entire function call as a single step — the viewer jumps from the call site to after the return, without showing any of the internal lines.

Use @stepover in your code to mark lines that should always behave as step-over regardless of which key is pressed:

result = sort(data)   # @stepover

Vim-style keys

The h/l/j/k bindings follow vim conventions:

  • h ← step backward
  • l → step forward
  • j step over forward
  • k step over backward