2020-10-19 07:33:15 -04:00
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# Read-eval-print-loop
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`deno repl` starts an read-eval-print-loop, which lets you interactively build
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up program state in the global context.
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## Keyboard shortcuts
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| Keystroke | Action |
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| --------------------- | ------------------------------------------------------------------------------------------------ |
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| Ctrl-A, Home | Move cursor to the beginning of line |
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| Ctrl-B, Left | Move cursor one character left |
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| Ctrl-C | Interrupt and cancel the current edit |
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| Ctrl-D | If if line _is_ empty, signal end of line |
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| Ctrl-D, Del | If line is _not_ empty, delete character under cursor |
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| Ctrl-E, End | Move cursor to end of line |
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| Ctrl-F, Right | Move cursor one character right |
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| Ctrl-H, Backspace | Delete character before cursor |
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| Ctrl-I, Tab | Next completion |
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| Ctrl-J, Ctrl-M, Enter | Finish the line entry |
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| Ctrl-K | Delete from cursor to end of line |
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| Ctrl-L | Clear screen |
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| Ctrl-N, Down | Next match from history |
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| Ctrl-P, Up | Previous match from history |
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| Ctrl-R | Reverse Search history (Ctrl-S forward, Ctrl-G cancel) |
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| Ctrl-T | Transpose previous character with current character |
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| Ctrl-U | Delete from start of line to cursor |
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| Ctrl-V | Insert any special character without performing its associated action (#65) |
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| Ctrl-W | Delete word leading up to cursor (using white space as a word boundary) |
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| Ctrl-X Ctrl-U | Undo |
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| Ctrl-Y | Paste from Yank buffer |
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| Ctrl-Y | Paste from Yank buffer (Meta-Y to paste next yank instead) |
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| Ctrl-Z | Suspend (Unix only) |
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| Ctrl-_ | Undo |
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| Meta-0, 1, ..., - | Specify the digit to the argument. `–` starts a negative argument. |
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| Meta-< | Move to first entry in history |
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| Meta-> | Move to last entry in history |
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| Meta-B, Alt-Left | Move cursor to previous word |
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| Meta-Backspace | Kill from the start of the current word, or, if between words, to the start of the previous word |
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| Meta-C | Capitalize the current word |
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| Meta-D | Delete forwards one word |
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| Meta-F, Alt-Right | Move cursor to next word |
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| Meta-L | Lower-case the next word |
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| Meta-T | Transpose words |
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| Meta-U | Upper-case the next word |
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| Meta-Y | See Ctrl-Y |
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2020-10-21 07:41:29 -04:00
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## Special variables
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| Identifier | Description |
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| ---------- | ------------------------------------ |
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| _ | Yields the last evaluated expression |
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| _error | Yields the last thrown error |
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