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Migration level (view source)

Revision as of 08:43, 8 February 2021

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{{Built-ins|Migration level|⎕ML|⎕EL}} or '''Evolution level''' is a number that, in [[Dyalog APL]] and [[APL+Win]] respectively, determines exact where the original [[NARS]] specification and the current [[APL2]] implementation differ. A lower value represents a behaviour closer to NARS, while a higher the value represents a behaviour closer to APL2.
{{Built-ins3|Migration level|⎕ML|⎕EL|⎕CS}}, '''Evolution level''', or '''Compatibility setting''' is a number that, in [[Dyalog APL]], [[APL+Win]], and [[APLX]] respectively, specifies exact behaviour relative to [[APL2]]. In Dyalog APL and APL+Win, a lower value represents a behaviour closer to the original [[NARS]] specification, while a higher the value represents a behaviour closer to APL2. In APLX, a lower value matches APL2 while a higher value indicates higher [[backwards compatibility]] with [[APL.68000]].


== APL+Win settings ==
== APL+Win settings ==
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=== Work-arounds ===
=== Work-arounds ===
When migrating to Dyalog APL, the below drop-ins for the affected [[built-in]]s allow setting <source lang=apl inline>⎕ML←1</source> while preserving code behaviour. It is then safe to programmatically (as shown in the rightmost column) change all occurrences of the affected built-ins with their respective covers.
When migrating to Dyalog APL, the below drop-ins for the affected [[built-ins]] allow setting <source lang=apl inline>⎕ML←1</source> while preserving code behaviour. It is then safe to programmatically (as shown in the rightmost column) change all occurrences of the affected built-ins with their respective covers.


{| class=wikitable
{| class=wikitable
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|}
|}
Alternatively, the definitions can be used directly inside the text substitutions, whereby one avoids polluting existing code with these cover names.
Alternatively, the definitions can be used directly inside the text substitutions, whereby one avoids polluting existing code with these cover names.
== APLX settings ==
APLX treats the value as a collection of individual bits, thus allowing the combination of an exact set of behaviours:
{|class=wikitable
| <source lang=apl inline>⎕CS←1</source> || [[Strand notation|Stranding]] is done before [[bracket indexing]]
|-
| <source lang=apl inline>⎕CS←2</source> || The [[name class]] of an invalid name is 4 rather than ¯1.
|-
| <source lang=apl inline>⎕CS←4</source> || Format (<source lang=apl inline>⍕</source>) and default output uses the same width for all columns, rather than determining  the  width separately for  each column.
|}


== External links ==
== External links ==
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=== Documentation ===
=== Documentation ===


* [http://help.dyalog.com/latest/#Language/System%20Functions/ml.htm Dyalog]
* [https://help.dyalog.com/latest/#Language/System%20Functions/ml.htm Dyalog]
* [http://microapl.com/apl_help/ch_020_070_140.htm APLX]


{{APL built-ins}}[[Category:System constants]]
{{APL built-ins}}[[Category:System constants]]
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