sw-apl — APL\360

  

  
  






  
sw-apl

  

    An APL\360 session, compiled to WebAssembly and running in a worker
    in this tab. There is no server: nothing typed here leaves your
    browser, and nothing is sent anywhere.
  

  
The keyboard

  

    An IBM 2741 APL keyboard layout
  

  
Four ways to enter a glyph

  
    
    
  1. Tap the board. Keyboard shows it. Keys are laid out
      like the 2741's, so tapping also shows you where the key is.
      ABC switches to letters and digits.
    2. 
    
  2. The 2741 layout. Unshifted letters are capitals;
      Shift-R is ⍴, Shift-L is
      ⎕. Hold Alt for the character a key is
      painted with.
    3. 
    
  3. Overstrikes. Ctrl-] strikes the last
      glyph, so ⍟ is ○, that key,
      *.
    4. 
    
  4. Paste. APL pasted in arrives as it is.
    5. 
  

  
Workspaces

  

    )LIB 1 lists the workspaces sw-apl ships;
    )LOAD 1 RACE loads one. )SAVE writes
    library 0 into this browser's own storage, so a saved workspace
    comes back next time you open this page in this browser -- and is
    in no other browser and on no other machine.
  

  
If it says there is no shared memory

  

    The interpreter stops and waits for a line, which needs a
    SharedArrayBuffer, which a browser grants only to an
    isolated page. Served locally by just demo or
    just pages-serve, that is two headers and it simply
    works. A static host will not send them, so the published page
    installs a service worker to add them and loads once more under
    it -- and a private window refuses that worker, which is the usual
    reason for the message. Close the tab and open it again, or run it
    locally.