True lazy (late-binding) editable, SALTable, Linkable, ⎕FIXable 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, ⎕FIXing, and commenting both arrays and tacit functions, and allows tacit top-down programming.
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Lazy.dyalogto a location - From within Dyalog APL issue
]Settings cmddir ,location -permanent
]Lazy ⍝ list all lazy definitions
]Lazy fn ⍝ show lazy definition
]Lazy fn←code ⍝ define lazily
]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