This VS Code extension provides support for the J programming language.
The extension currently provides syntax highlighting and interaction with the Jconsole.
The above code snippet uses the Monokai color theme with some tweaks discussed below.
Install the J extension from Extensions Marketplace within VS Code or from the VS Code Marketplace.
In the VS Code extensions view, search for j or language-j in the marketplace
search box.
To integrate with your installed Jconsole, make an entry for j.executablePath in VS Code User Settings (Ctrl+,) that points to the Jconsole executable, for example: "j.executablePath": "/home/elmo/j901/bin/jconsole" or on Windows:
"j.executablePath": ""C:\\Program Files\\j901\\bin\\jconsole.exe"
To distinguish some of the J's additional language features (e.g. verbs, adverbs, conjunctions) that are not commonly catered for in color themes, a number of suggested additions for your User Settings are provided in the user_settings_j.json file. The colors used were chosen to work with the Monokai theme.
When one of the Execute or Load J commands from the Command Palette (see table) is run from an .ijs script, the command will be executed in the most recently active Jconsole terminal. If no Jconsole terminal is currently running, then a new one will be created first.
When an Execute command is run and there is no selection, then if the line the cursor is on is the first line of a multi-line definition (explicit or direct definition) the entire multi-line definition will be run. Otherwise just the entire line will be executed in the terminal. If there is a selection (within a line or over multiple lines), then the selected text will be executed in the terminal.
When a Load Script command is run, the script will be saved to disk prior to loading it in the terminal.
| Command Palette | Description |
|---|---|
| J: Execute Line/Selecton and Advance | Execute and advance to the next non-blank line |
| J: Execute Line/Selection | Execute without advancing |
| J: Load Script | load the script file |
| J: Load and Display Script | load the script file with display |
| J: Create JConsole Terminal | Manually start a new Jconsole terminal |
See the Change Log for release notes.