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JBreak: forcing J to stop executing the current process

JBreak is a separate program (i.e. application), distinct from the J IDE itself.

  • In Windows it is a desktop or Start menu item with the "yellow J" icon.
  • On the Apple Macintosh it is an "app" with the "yellow J" icon. Its usual position is in "Dock".

If you click this item when J is running, it causes J to signal an attention interrupt error.

Technically this is a J error, but logically it is not a mistake since it can only arise via deliberate action by the user.

If J appears to "freeze" (e.g. by executing a very long loop) this provides you a way to force J to stop what it is doing and issue a prompt for new input.