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| run online            = [https://joebo.github.io/j-emscripten/ Emscripten], [https://jsoftware.github.io/j-playground/bin/html/ J playground]
| run online            = [https://joebo.github.io/j-emscripten/ Emscripten], [https://jsoftware.github.io/j-playground/bin/html/ J playground]
}}
}}
'''J''' is an array language loosely following the [[SHARP APL]] tradition which uses [[wikipedia:ASCII|ASCII]] characters for primitive functionality and builds in [[leading axis theory]] and [[tacit programming]] as foundational design principles. J discards backwards compatibility with older APLs in order to simplify and regularize its syntax, redesign primitives to work on leading axes, and disentangle [[reduction]] from [[scan]]s and [[windowed reduction]]s (yielding the [[Prefix operator|prefix]] and [[infix operator]]s). However, J concepts such as [[function train]]s and the [[Indices]] function have been adopted by later APLs such as [[NARS2000]], [[Dyalog APL]], and [[dzaima/APL]]. J breaks the APL convention of writing primitives with a single glyph: instead, they are spelled with a single ASCII character possibly followed by one or two periods (<source lang=j inline>.</source>) or colons (<source lang=j inline>:</source>). It is also notable for its use of terms from English grammar to describe the language. For example, [[function]]s are called "verbs" while arrays are called "nouns".
'''J''' is an array language loosely following the [[SHARP APL]] tradition which uses [[wikipedia:ASCII|ASCII]] characters for primitive functionality and builds in [[leading axis theory]] and [[tacit programming]] as foundational design principles. J discards backwards compatibility with older APLs in order to simplify and regularize its syntax, redesign primitives to work on leading axes, and disentangle [[reduction]] from [[scan]]s and [[windowed reduction]]s (yielding the [[Prefix operator|prefix]] and [[infix operator]]s). However, J concepts such as [[function train]]s and the [[Indices]] function have been adopted by later APLs such as [[NARS2000]], [[Dyalog APL]], and [[dzaima/APL]]. J breaks the APL convention of writing primitives with a single glyph: instead, they are spelled with a single ASCII character possibly followed by one or two periods (<syntaxhighlight lang=j inline>.</source>) or colons (<syntaxhighlight lang=j inline>:</source>). It is also notable for its use of terms from English grammar to describe the language. For example, [[function]]s are called "verbs" while arrays are called "nouns".


== History ==
== History ==
Line 53: Line 53:
| 2.8  || 1990-11-15 ||
| 2.8  || 1990-11-15 ||
|-
|-
| 2.9  || 1991-02-15 || Monadic <source lang=j inline>+:</source> (double), <source lang=j inline>-:</source> (halve), <source lang=j inline>*:</source> (square), dyadic <source lang=j inline>":</source> ([[Format]]), constant functions <source lang=j inline>0:</source> and <source lang=j inline>1:</source>
| 2.9  || 1991-02-15 || Monadic <syntaxhighlight lang=j inline>+:</source> (double), <syntaxhighlight lang=j inline>-:</source> (halve), <syntaxhighlight lang=j inline>*:</source> (square), dyadic <syntaxhighlight lang=j inline>":</source> ([[Format]]), constant functions <syntaxhighlight lang=j inline>0:</source> and <syntaxhighlight lang=j inline>1:</source>
|-
|-
| 3.0  || 1991-03-17 || Changes to spellings, [[Reverse]] with [[Variant]] to specify [[fill]]
| 3.0  || 1991-03-17 || Changes to spellings, [[Reverse]] with [[Variant]] to specify [[fill]]
|-
|-
| 3.1  || 1991-05-17 || [[Determinant]] (<source lang=j inline>.</source>)
| 3.1  || 1991-05-17 || [[Determinant]] (<syntaxhighlight lang=j inline>.</source>)
|-
|-
| 3.2  || 1991-06-02 || <source lang=j inline>,.</source> for ravel items (like [[Table]]) and append lists, <source lang=j inline>;</source> for [[Raze]] and [[Link]], <source lang=j inline>@.</source> for agenda, non-[[close composition]]s
| 3.2  || 1991-06-02 || <syntaxhighlight lang=j inline>,.</source> for ravel items (like [[Table]]) and append lists, <syntaxhighlight lang=j inline>;</source> for [[Raze]] and [[Link]], <syntaxhighlight lang=j inline>@.</source> for agenda, non-[[close composition]]s
|-
|-
| 3.3  || 1991-06-25 || Dyadic <source lang=j inline>,.</source> changed to append items, more types of trains
| 3.3  || 1991-06-25 || Dyadic <syntaxhighlight lang=j inline>,.</source> changed to append items, more types of trains
|-
|-
| 3.4  || 1991-07-15 || <source lang=j inline>NB.</source> for comments
| 3.4  || 1991-07-15 || <syntaxhighlight lang=j inline>NB.</source> for comments
|-
|-
| 4.0  || 1991-11-23 || Monadic <source lang=j inline>+.</source> and <source lang=j inline>*.</source> for complex components and phase/magnitude with <source lang=j inline>j.</source> and <source lang=j inline>r.</source> to recombine, <source lang=j inline>^:_</source> for power limit
| 4.0  || 1991-11-23 || Monadic <syntaxhighlight lang=j inline>+.</source> and <syntaxhighlight lang=j inline>*.</source> for complex components and phase/magnitude with <syntaxhighlight lang=j inline>j.</source> and <syntaxhighlight lang=j inline>r.</source> to recombine, <syntaxhighlight lang=j inline>^:_</source> for power limit
|-
|-
| 4.1  || 1992-02-02 || <source lang=j inline>^!.p</source> for rising/falling factorials
| 4.1  || 1992-02-02 || <syntaxhighlight lang=j inline>^!.p</source> for rising/falling factorials
|-
|-
| 4.2  || 1992-03-19 ||
| 4.2  || 1992-03-19 ||
Line 73: Line 73:
| 5.0  || 1992-06-22 || [[Variant]] to specify [[comparison tolerance]] and [[fill]] for [[Take]]
| 5.0  || 1992-06-22 || [[Variant]] to specify [[comparison tolerance]] and [[fill]] for [[Take]]
|-
|-
| 5.1  || 1992-07-28 || <source lang=j inline>f.</source> to expand a tacit function containing names, constant functions <source lang=j inline>2:</source> to <source lang=j inline>9:</source>
| 5.1  || 1992-07-28 || <syntaxhighlight lang=j inline>f.</source> to expand a tacit function containing names, constant functions <syntaxhighlight lang=j inline>2:</source> to <syntaxhighlight lang=j inline>9:</source>
|-
|-
| 5.1a || 1992-08-11 ||
| 5.1a || 1992-08-11 ||
|-
|-
| 6.0  || 1992-10-24 || Error handling with <source lang=j inline>::</source>, additional [[system function]]s
| 6.0  || 1992-10-24 || Error handling with <syntaxhighlight lang=j inline>::</source>, additional [[system function]]s
|-
|-
| 6.1  || 1992-11-26 || [[Amend]] operator <source lang=j inline>}</source>
| 6.1  || 1992-11-26 || [[Amend]] operator <syntaxhighlight lang=j inline>}</source>
|-
|-
| 6.2  || 1992-12-20 || Derivative operator <source lang=j inline>D.</source>
| 6.2  || 1992-12-20 || Derivative operator <syntaxhighlight lang=j inline>D.</source>
|-
|-
| 7.0  || 1993-11-14 || [[wikipedia:Taylor series|Taylor series]] operators <source lang=j inline>t.</source> and <source lang=j inline>T.</source>
| 7.0  || 1993-11-14 || [[wikipedia:Taylor series|Taylor series]] operators <syntaxhighlight lang=j inline>t.</source> and <syntaxhighlight lang=j inline>T.</source>
|}
|}


Line 95: Line 95:
| 2.04 || 1994-11-28 ||
| 2.04 || 1994-11-28 ||
|-
|-
| 2.05 || 1995-02-26 || Additional [[inverse]]s, [[primitive array]] <source lang=j inline>a:</source> ("ace")
| 2.05 || 1995-02-26 || Additional [[inverse]]s, [[primitive array]] <syntaxhighlight lang=j inline>a:</source> ("ace")
|-
|-
| 2.06 || 1995-05-30 || More [[inverse]]s, hypergeometric operator <source lang=j inline>H.</source>, and prime functions <source lang=j inline>p.</source>, <source lang=j inline>p:</source>, and <source lang=j inline>q:</source>
| 2.06 || 1995-05-30 || More [[inverse]]s, hypergeometric operator <syntaxhighlight lang=j inline>H.</source>, and prime functions <syntaxhighlight lang=j inline>p.</source>, <syntaxhighlight lang=j inline>p:</source>, and <syntaxhighlight lang=j inline>q:</source>
|-
|-
| 3.01 || 1996-01-16 || Repeatable [[Roll]]/[[Deal]] <source lang=j inline>?.</source>, [[Depth]] <source lang=j inline>L.</source> and [[Depth operator]] <source lang=j inline>L:</source>, [[total array ordering]]
| 3.01 || 1996-01-16 || Repeatable [[Roll]]/[[Deal]] <syntaxhighlight lang=j inline>?.</source>, [[Depth]] <syntaxhighlight lang=j inline>L.</source> and [[Depth operator]] <syntaxhighlight lang=j inline>L:</source>, [[total array ordering]]
|-
|-
| 3.02 || 1996-06-24 || [[Pick]] variant <source lang=j inline>{::</source>, [[extended precision]] types
| 3.02 || 1996-06-24 || [[Pick]] variant <syntaxhighlight lang=j inline>{::</source>, [[extended precision]] types
|-
|-
| 3.03 || 1996-12-13 || [[Multiple assignment]] using a string target
| 3.03 || 1996-12-13 || [[Multiple assignment]] using a string target
|-
|-
| 3.04 || 1997-05-19 || More operators with gerund operands, <source lang=j inline>for.</source> and <source lang=j inline>select.</source> [[control structure]]s
| 3.04 || 1997-05-19 || More operators with gerund operands, <syntaxhighlight lang=j inline>for.</source> and <syntaxhighlight lang=j inline>select.</source> [[control structure]]s
|-
|-
| 3.05 || 1997-09-27 || Extended dyad <source lang=j inline>q:</source> ([[Factor]]) to take a negative left argument
| 3.05 || 1997-09-27 || Extended dyad <syntaxhighlight lang=j inline>q:</source> ([[Factor]]) to take a negative left argument
|-
|-
| 4.01 || 1998-03-22 || [[Find]] (<source lang=j inline>E.</source>) and [[Index of Last]] (<source lang=j inline>i:</source>)
| 4.01 || 1998-03-22 || [[Find]] (<syntaxhighlight lang=j inline>E.</source>) and [[Index of Last]] (<syntaxhighlight lang=j inline>i:</source>)
|-
|-
| 4.02 || 1998-11-07 || Symmetric range monad (<source lang=j inline>i:</source>), infinite left arguments to [[Take]]
| 4.02 || 1998-11-07 || Symmetric range monad (<syntaxhighlight lang=j inline>i:</source>), infinite left arguments to [[Take]]
|-
|-
| 4.03 || 1999-04-21 ||
| 4.03 || 1999-04-21 ||
Line 119: Line 119:
| 4.05 || 2000-09-05 || [[Comparison tolerance]] for [[Key]]
| 4.05 || 2000-09-05 || [[Comparison tolerance]] for [[Key]]
|-
|-
| 4.06 || 2001-05-09 || <source lang=j inline>assert.</source> and <source lang=j inline>throw.</source>, Symbols (<source lang=j inline>s:</source>) and Unicode (<source lang=j inline>u:</source>), multiple axes in [[Cut]] operator
| 4.06 || 2001-05-09 || <syntaxhighlight lang=j inline>assert.</source> and <syntaxhighlight lang=j inline>throw.</source>, Symbols (<syntaxhighlight lang=j inline>s:</source>) and Unicode (<syntaxhighlight lang=j inline>u:</source>), multiple axes in [[Cut]] operator
|-
|-
| 5.01 || 2002-09-10 || Non-[[Close composition|close]] [[Under]] <source lang=j inline>&.:</source>, Bitwise Operations (<source lang=j inline>b.</source>), Polynomial Derivative (<source lang=j inline>p..</source>), Head (<source lang=j inline>{.</source>) and Tail (<source lang=j inline>{:</source>) allow [[empty]] arguments
| 5.01 || 2002-09-10 || Non-[[Close composition|close]] [[Under]] <syntaxhighlight lang=j inline>&.:</source>, Bitwise Operations (<syntaxhighlight lang=j inline>b.</source>), Polynomial Derivative (<syntaxhighlight lang=j inline>p..</source>), Head (<syntaxhighlight lang=j inline>{.</source>) and Tail (<syntaxhighlight lang=j inline>{:</source>) allow [[empty]] arguments
|-
|-
| 5.02 || 2003-05-21 ||
| 5.02 || 2003-05-21 ||
|-
|-
| 5.03 || 2004-03-19 || [[Indices]] (<source lang=j inline>I.</source>), Sequential Machine (<source lang=j inline>;:</source>)
| 5.03 || 2004-03-19 || [[Indices]] (<syntaxhighlight lang=j inline>I.</source>), Sequential Machine (<syntaxhighlight lang=j inline>;:</source>)
|-
|-
| 5.04 || 2005-03-18 || J64 (64-bit version) introduced, boxed right argument for [[Power operator]], [[scalar extension]] for left argument of [[Cut]] (<source lang=j inline>;.</source>)
| 5.04 || 2005-03-18 || J64 (64-bit version) introduced, boxed right argument for [[Power operator]], [[scalar extension]] for left argument of [[Cut]] (<syntaxhighlight lang=j inline>;.</source>)
|-
|-
| 6.01 || 2006-07-21 || Noun left arguments in trains (<source lang=j inline>N0 V1 V2</source>), dots removed from explicit argument names (<source lang=j inline>y.</source> to <source lang=j inline>y</source>, etc.), [[Interval Index]] (<source lang=j inline>I.</source>)
| 6.01 || 2006-07-21 || Noun left arguments in trains (<syntaxhighlight lang=j inline>N0 V1 V2</source>), dots removed from explicit argument names (<syntaxhighlight lang=j inline>y.</source> to <syntaxhighlight lang=j inline>y</source>, etc.), [[Interval Index]] (<syntaxhighlight lang=j inline>I.</source>)
|-
|-
| 6.02 || 2008-02-29 || [[Index Of]] (<source lang=j inline>i.</source>) extended to allow unmatched cell shapes, Memoize adverb (<source lang=j inline>M.</source>)
| 6.02 || 2008-02-29 || [[Index Of]] (<syntaxhighlight lang=j inline>i.</source>) extended to allow unmatched cell shapes, Memoize adverb (<syntaxhighlight lang=j inline>M.</source>)
|-
|-
| 7.01 || 2010-08-05 || GTK IDE
| 7.01 || 2010-08-05 || GTK IDE
Line 147: Line 147:
| 8.05 || 2016-12-19 || Improved UTF-8 handling, memory allocator rewritten with more in-place argument usage
| 8.05 || 2016-12-19 || Improved UTF-8 handling, memory allocator rewritten with more in-place argument usage
|-
|-
| 8.06 || 2017-11-12 || Allow array right operands to [[Atop]] and Adverse (<source lang=j inline>::</source>), treating as constant functions, improved [[Vector instructions|vector instruction]] usage
| 8.06 || 2017-11-12 || Allow array right operands to [[Atop]] and Adverse (<syntaxhighlight lang=j inline>::</source>), treating as constant functions, improved [[Vector instructions|vector instruction]] usage
|-
|-
| 8.07 || 2018-10-08 || Removed support for dot-style explicit arguments (e.g. <source lang=j inline>y.</source>)
| 8.07 || 2018-10-08 || Removed support for dot-style explicit arguments (e.g. <syntaxhighlight lang=j inline>y.</source>)
|-
|-
| 9.01 || 2019-12-15 || Iteration primitives <source lang=j inline>F..</source>, <source lang=j inline>F.:</source>, <source lang=j inline>F.</source>, <source lang=j inline>F:.</source>, <source lang=j inline>F::</source>, <source lang=j inline>F:</source>; Remove calculus operators <source lang=j inline>d.</source>, <source lang=j inline>D.</source>, <source lang=j inline>D:</source>, <source lang=j inline>t.</source>, <source lang=j inline>t:</source>, <source lang=j inline>T.</source>, <source lang=j inline>..</source>, <source lang=j inline>.:</source>; <source lang=j inline>gerund"r</source>
| 9.01 || 2019-12-15 || Iteration primitives <syntaxhighlight lang=j inline>F..</source>, <syntaxhighlight lang=j inline>F.:</source>, <syntaxhighlight lang=j inline>F.</source>, <syntaxhighlight lang=j inline>F:.</source>, <syntaxhighlight lang=j inline>F::</source>, <syntaxhighlight lang=j inline>F:</source>; Remove calculus operators <syntaxhighlight lang=j inline>d.</source>, <syntaxhighlight lang=j inline>D.</source>, <syntaxhighlight lang=j inline>D:</source>, <syntaxhighlight lang=j inline>t.</source>, <syntaxhighlight lang=j inline>t:</source>, <syntaxhighlight lang=j inline>T.</source>, <syntaxhighlight lang=j inline>..</source>, <syntaxhighlight lang=j inline>.:</source>; <syntaxhighlight lang=j inline>gerund"r</source>
|-
|-
| 9.02 || 2020-12-13 || "Direct definition" syntax for explicit functions, special semidual form <source lang=j inline>u&.:(a:`v)</source> added, minor incompatible changes
| 9.02 || 2020-12-13 || "Direct definition" syntax for explicit functions, special semidual form <syntaxhighlight lang=j inline>u&.:(a:`v)</source> added, minor incompatible changes
|-
|-
| 9.03 || 2021-12-17 || Modifier trains and other combinations, foreigns to enable nameref caching, Kahan summation with <source lang=j inline>+/!.0</source>
| 9.03 || 2021-12-17 || Modifier trains and other combinations, foreigns to enable nameref caching, Kahan summation with <syntaxhighlight lang=j inline>+/!.0</source>
|}
|}



Revision as of 22:06, 10 September 2022

J is an array language loosely following the SHARP APL tradition which uses ASCII characters for primitive functionality and builds in leading axis theory and tacit programming as foundational design principles. J discards backwards compatibility with older APLs in order to simplify and regularize its syntax, redesign primitives to work on leading axes, and disentangle reduction from scans and windowed reductions (yielding the prefix and infix operators). However, J concepts such as function trains and the Indices function have been adopted by later APLs such as NARS2000, Dyalog APL, and dzaima/APL. J breaks the APL convention of writing primitives with a single glyph: instead, they are spelled with a single ASCII character possibly followed by one or two periods (<syntaxhighlight lang=j inline>.</source>) or colons (<syntaxhighlight lang=j inline>:</source>). It is also notable for its use of terms from English grammar to describe the language. For example, functions are called "verbs" while arrays are called "nouns".

History

J was initially designed primarily by Ken Iverson and Roger Hui, with input from Arthur Whitney and Eric Iverson. Ken had been considering a new language based on A Dictionary of APL but without the backwards compatibility constraints of APL and the custom character set (which was a major technical issue at the time). In "A Personal View of APL"[1] he gives the following as the most important goals for a new language:

  • Is available as “shareware”, and is inexpensive enough to be acquired by students as well as by schools
  • Can be printed on standard printers
  • Runs on a wide variety of computers
  • Provides the simplicity and the generality of the latest thinking in APL

Iverson's phrase "the latest thinking in APL" refers to two major breakthroughs made that decade: the invention of the Rank operator by Arthur Whitney in 1982 and subsequent development of leading axis theory, and the invention of function trains by Iverson and Eugene McDonnell in 1988.

In the summer of 1989 Whitney visited Iverson, who discussed with Whitney his plans for a new array language. Whitney wrote a one-page prototype for the language in a single afternoon using C. Iverson shared the program with Roger Hui, who began working on J on August 27 and quickly produced a more complete prototype.[1][2][3] The name "J", chosen by Hui when saving the first source code file, is meaningless: in An Implementation of J, Hui remarks "Why 'J'? It is easy to type."[4] J was first presented by Hui and Iverson, including a live demo, at a meeting of the Toronto APLSIG in February 1990.[5]

In 1990 Hui and Iverson joined Iverson Software Inc. (now Jsoftware), which had been founded that year by Eric Iverson to sell a SHARP APL product. Eric converted his SHARP session to use with J as Hui continued on the core language's implementation. The J language, including Eric's session environment, was first released at APL90 in Copenhagen August 1990.[5]

Versions

J has used two numbering systems. Releases prior to 1994 used a single decimal and the naming scheme "Version X.Y", while those after used two decimals and are called "Release X.YY", or "JXYY" as in "J807".

Version Date Features
2.0 1990-08-09 (APL90)
2.7 1990-10-22 Rank with a function right operand, Under
2.8 1990-11-15
2.9 1991-02-15 Monadic <syntaxhighlight lang=j inline>+:</source> (double), <syntaxhighlight lang=j inline>-:</source> (halve), <syntaxhighlight lang=j inline>*:</source> (square), dyadic <syntaxhighlight lang=j inline>":</source> (Format), constant functions <syntaxhighlight lang=j inline>0:</source> and <syntaxhighlight lang=j inline>1:</source>
3.0 1991-03-17 Changes to spellings, Reverse with Variant to specify fill
3.1 1991-05-17 Determinant (<syntaxhighlight lang=j inline>.</source>)
3.2 1991-06-02 <syntaxhighlight lang=j inline>,.</source> for ravel items (like Table) and append lists, <syntaxhighlight lang=j inline>;</source> for Raze and Link, <syntaxhighlight lang=j inline>@.</source> for agenda, non-close compositions
3.3 1991-06-25 Dyadic <syntaxhighlight lang=j inline>,.</source> changed to append items, more types of trains
3.4 1991-07-15 <syntaxhighlight lang=j inline>NB.</source> for comments
4.0 1991-11-23 Monadic <syntaxhighlight lang=j inline>+.</source> and <syntaxhighlight lang=j inline>*.</source> for complex components and phase/magnitude with <syntaxhighlight lang=j inline>j.</source> and <syntaxhighlight lang=j inline>r.</source> to recombine, <syntaxhighlight lang=j inline>^:_</source> for power limit
4.1 1992-02-02 <syntaxhighlight lang=j inline>^!.p</source> for rising/falling factorials
4.2 1992-03-19
5.0 1992-06-22 Variant to specify comparison tolerance and fill for Take
5.1 1992-07-28 <syntaxhighlight lang=j inline>f.</source> to expand a tacit function containing names, constant functions <syntaxhighlight lang=j inline>2:</source> to <syntaxhighlight lang=j inline>9:</source>
5.1a 1992-08-11
6.0 1992-10-24 Error handling with <syntaxhighlight lang=j inline>::</source>, additional system functions
6.1 1992-11-26 Amend operator <syntaxhighlight lang=j inline>}</source>
6.2 1992-12-20 Derivative operator <syntaxhighlight lang=j inline>D.</source>
7.0 1993-11-14 Taylor series operators <syntaxhighlight lang=j inline>t.</source> and <syntaxhighlight lang=j inline>T.</source>
Release Date Features
2.01 1994-09-01 Control structures, many additional system functions
2.03 1994-09-21
2.04 1994-11-28
2.05 1995-02-26 Additional inverses, primitive array <syntaxhighlight lang=j inline>a:</source> ("ace")
2.06 1995-05-30 More inverses, hypergeometric operator <syntaxhighlight lang=j inline>H.</source>, and prime functions <syntaxhighlight lang=j inline>p.</source>, <syntaxhighlight lang=j inline>p:</source>, and <syntaxhighlight lang=j inline>q:</source>
3.01 1996-01-16 Repeatable Roll/Deal <syntaxhighlight lang=j inline>?.</source>, Depth <syntaxhighlight lang=j inline>L.</source> and Depth operator <syntaxhighlight lang=j inline>L:</source>, total array ordering
3.02 1996-06-24 Pick variant <syntaxhighlight lang=j inline>{::</source>, extended precision types
3.03 1996-12-13 Multiple assignment using a string target
3.04 1997-05-19 More operators with gerund operands, <syntaxhighlight lang=j inline>for.</source> and <syntaxhighlight lang=j inline>select.</source> control structures
3.05 1997-09-27 Extended dyad <syntaxhighlight lang=j inline>q:</source> (Factor) to take a negative left argument
4.01 1998-03-22 Find (<syntaxhighlight lang=j inline>E.</source>) and Index of Last (<syntaxhighlight lang=j inline>i:</source>)
4.02 1998-11-07 Symmetric range monad (<syntaxhighlight lang=j inline>i:</source>), infinite left arguments to Take
4.03 1999-04-21
4.04 2000-01-02 Sparse array support
4.05 2000-09-05 Comparison tolerance for Key
4.06 2001-05-09 <syntaxhighlight lang=j inline>assert.</source> and <syntaxhighlight lang=j inline>throw.</source>, Symbols (<syntaxhighlight lang=j inline>s:</source>) and Unicode (<syntaxhighlight lang=j inline>u:</source>), multiple axes in Cut operator
5.01 2002-09-10 Non-close Under <syntaxhighlight lang=j inline>&.:</source>, Bitwise Operations (<syntaxhighlight lang=j inline>b.</source>), Polynomial Derivative (<syntaxhighlight lang=j inline>p..</source>), Head (<syntaxhighlight lang=j inline>{.</source>) and Tail (<syntaxhighlight lang=j inline>{:</source>) allow empty arguments
5.02 2003-05-21
5.03 2004-03-19 Indices (<syntaxhighlight lang=j inline>I.</source>), Sequential Machine (<syntaxhighlight lang=j inline>;:</source>)
5.04 2005-03-18 J64 (64-bit version) introduced, boxed right argument for Power operator, scalar extension for left argument of Cut (<syntaxhighlight lang=j inline>;.</source>)
6.01 2006-07-21 Noun left arguments in trains (<syntaxhighlight lang=j inline>N0 V1 V2</source>), dots removed from explicit argument names (<syntaxhighlight lang=j inline>y.</source> to <syntaxhighlight lang=j inline>y</source>, etc.), Interval Index (<syntaxhighlight lang=j inline>I.</source>)
6.02 2008-02-29 Index Of (<syntaxhighlight lang=j inline>i.</source>) extended to allow unmatched cell shapes, Memoize adverb (<syntaxhighlight lang=j inline>M.</source>)
7.01 2010-08-05 GTK IDE
7.02
8.01 2014-02 Qt IDE
8.02 2014-08-02 Qt IDE improved
8.03 2014-12-09 Native read/write of jpeg and png images
8.04 2016-01-04
8.05 2016-12-19 Improved UTF-8 handling, memory allocator rewritten with more in-place argument usage
8.06 2017-11-12 Allow array right operands to Atop and Adverse (<syntaxhighlight lang=j inline>::</source>), treating as constant functions, improved vector instruction usage
8.07 2018-10-08 Removed support for dot-style explicit arguments (e.g. <syntaxhighlight lang=j inline>y.</source>)
9.01 2019-12-15 Iteration primitives <syntaxhighlight lang=j inline>F..</source>, <syntaxhighlight lang=j inline>F.:</source>, <syntaxhighlight lang=j inline>F.</source>, <syntaxhighlight lang=j inline>F:.</source>, <syntaxhighlight lang=j inline>F::</source>, <syntaxhighlight lang=j inline>F:</source>; Remove calculus operators <syntaxhighlight lang=j inline>d.</source>, <syntaxhighlight lang=j inline>D.</source>, <syntaxhighlight lang=j inline>D:</source>, <syntaxhighlight lang=j inline>t.</source>, <syntaxhighlight lang=j inline>t:</source>, <syntaxhighlight lang=j inline>T.</source>, <syntaxhighlight lang=j inline>..</source>, <syntaxhighlight lang=j inline>.:</source>; <syntaxhighlight lang=j inline>gerund"r</source>
9.02 2020-12-13 "Direct definition" syntax for explicit functions, special semidual form <syntaxhighlight lang=j inline>u&.:(a:`v)</source> added, minor incompatible changes
9.03 2021-12-17 Modifier trains and other combinations, foreigns to enable nameref caching, Kahan summation with <syntaxhighlight lang=j inline>+/!.0</source>

References

  1. 1.0 1.1 Iverson, K.E. "A Personal View of APL". IBM Systems Journal, Volume 30, Number 4. 1991-12.
  2. Hui, Roger. "Incunabulum". From An Implementation of J, Appendix A: Incunabulum, 1992-01-27.
  3. McIntyre, Donald. "A Tribute to Roger Hui, presented at APL96". 1996.
  4. Hui, Roger. An Implementation of J (pdf), Preface. 1992-01-27.
  5. 5.0 5.1 Hui, Roger. "Remembering Ken Iverson". 2004-11.
APL dialects [edit]
Maintained APL+WinAPL2APL64APL\ivApletteAprilCo-dfnsDyalog APLdzaima/APLExtended Dyalog APLGNU APLKAPNARS2000Pometo
Historical A Programming LanguageA+ (A) ∙ APL#APL\360APL/700APL\1130APL\3000APL.68000APL*PLUSAPL.jlAPL.SVAPLXIverson notationIVSYS/7090NARSngn/aplopenAPLOperators and FunctionsPATRowanSAXSHARP APLRationalized APLVisualAPL (APLNext) ∙ VS APLYork APL
Derivatives AHPLBQNCoSyELIGleeIIvyJJellyJellyfishK (Q, KDB+) ∙ Lang5NialRAD
Overviews Timeline of array languagesTimeline of influential array languagesFamily tree of array languages