https://github.com/abrudz/lazy

Lazily evaluated (late-binding) definition for Dyalog APL
https://github.com/abrudz/lazy

apl dyalog dyalog-apl dyalogapl late-binding lazy-evaluation points-free programming tacit user-command

Last synced: about 2 months ago
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Lazily evaluated (late-binding) definition for Dyalog APL

• Host: GitHub
• URL: https://github.com/abrudz/lazy
• Owner: abrudz
• License: unlicense
• Created: 2018-06-07T10:49:16.000Z (almost 7 years ago)
• Default Branch: master
• Last Pushed: 2023-03-24T15:39:10.000Z (about 2 years ago)
• Last Synced: 2025-02-10T15:30:40.008Z (3 months ago)
• Topics: apl, dyalog, dyalog-apl, dyalogapl, late-binding, lazy-evaluation, points-free, programming, tacit, user-command
• Language: APL
• Homepage:
• Size: 15.6 KB
• Stars: 4
• Watchers: 3
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

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README

        
# Lazily evaluated (late-binding) definition for Dyalog APL

*True lazy (late-binding) editable, SALTable, Linkable, `⎕FIX`able definition*

This user command allows defintion of arrays and tacit functions in a lazy manner, which means that their definitions are not evaluated until runtime. This allows editing, SALTing, Linking, `⎕FIX`ing, and commenting both arrays and tacit functions, and allows tacit top-down programming.

## Installation

* Download `Lazy.dyalog` to a location

* From within Dyalog APL issue ]Settings cmddir ,*location* -permanent

## Usage

    ]Lazy          ⍝ list all lazy definitions

    ]Lazy fn       ⍝ show lazy definition

    ]Lazy fn←code  ⍝ define lazily

## Examples                                                                                                       

    ]Lazy Avg←Sum÷1⌈≢     ⍝ allowed even though Sum is not defined yet

    ]Lazy Sum←+⌿

    ]Lazy matrix←3 4⍴⍳12  ⍝ formula will be kept rather than executed, so this array is dynamically ⎕IO-dependent