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Backwards compatibility: Difference between revisions
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In the 1970s and early 1980s it was common to create new APL implementations to run on new hardware. These implementations almost always shared the primitive set of [[APL.SV]] or another IBM APL, but often developed new [[system function]]s or other peripheral functionality to better match the host system. | In the 1970s and early 1980s it was common to create new APL implementations to run on new hardware. These implementations almost always shared the primitive set of [[APL.SV]] or another IBM APL, but often developed new [[system function]]s or other peripheral functionality to better match the host system. | ||
Even the languages listed above may make changes to existing behavior. [[APL2]] broke from [[APL\360]] by promoting [[bracket indexing]] to higher precedence than [[stranding]], a decision that wasn't taken up by its contemporary [[Dyalog APL]], but was shared by some later dialects including [[APLX]] and [[GNU APL]]. More recently, [[Dyalog APL 13.0]] broke compatibility for the [[Power]] function while introducing [[complex number]]s, which were controversial feature for that and other reasons. Some dialects include a [[compatibility setting]] as a [[system variable]]. | Even the languages listed above may make changes to existing behavior. [[APL2]] broke from [[APL\360]] by promoting [[bracket indexing]] to higher [[precedence]] than [[stranding]], a decision that wasn't taken up by its contemporary [[Dyalog APL]], but was shared by some later dialects including [[APLX]] and [[GNU APL]]. More recently, [[Dyalog APL 13.0]] broke compatibility for the [[Power]] function while introducing [[complex number]]s, which were controversial feature for that and other reasons. Some dialects include a [[compatibility setting]] as a [[system variable]]. | ||
Notable APL dialects or offshoots that discard backwards compatibility with APL in significant ways include: | Notable APL dialects or offshoots that discard backwards compatibility with APL in significant ways include: | ||