Year 
Dialect 
Primitives

1965 
IVSYS/7090 
Identity (+ ), Add, Negate, Subtract, Multiply, Divide, Floor, Ceiling, Minimum, Maximum, Absolute value, Modulus, Exponential, Power, Not, And, Or, comparisons, Iota, Index of, Shape, Reshape, Ravel, Catenate, Rotate (as ↑↓ ), Member of, Encode, Decode, Reduce, Compress, Expand, Inner product, Outer product, Assignment (including indexed), Bracket indexing, Branch/Label

1966 
APL\360 
Reciprocal, Natural Logarithm, Factorial, Combinations, Roll, Transpose, Reverse/Rotate (⌽ ), Function axis

1968 
APL\360 
Signum, Logarithm, Deal, Pi times, Circular, Nand, Nor, Take (↑ ), Drop (↓ ), Grade, Reverse First/Rotate First (⊖ ), IBeam

1970 
APL\360 
overtake with Take

1970 
APL\360 
Matrix Inverse, Matrix Divide, Laminate (,[] )

1973 
APL.SV 
Execute, Format, Scan

1974 
APL/700 
Union, Intersection, Set Difference (but these functions only return unique elements), modified assignment (scalar dyadics only)

1980 
SHARP APL 
GCD/LCM extending Or/And (proposed McDonnell 1975)

1980 
SHARP APL 
Replicate extending Compress (Bernecky 1980) dyadic and highrank Grade (proposed Howard Smith 1979)

1981 
NARS

Enclose, Match, Pick, nested Index Generator, stranded assignment (proposed Brown 1971)

Unique, Union, Intersection, Set Difference, Commute (⍨ ), Under (⍢ ), Power (⍣ ), Windowed Reduction (Operators and Functions 1978)

Partitioned Enclose (⊂ ), First (⊃ ), Type (⊤ ), Split (↓ ), Mix (↑ ), Not Match, Catenate First (⍪ ), Compose (∘ ), Each (¨ ), Zilde, Choose indexing

1981 
SHARP APL 
function rank, close Over (⍤ ), Atop (⍥ ), Under (¨ ) (Operators and Functions 1978; not widely adopted) complex extensions: Circular functions 8 and up (McDonnell 1977), Conjugate (proposed Paul Penfield 1977; IBM documenation by 1975)

1982 
SHARP APL 
Determinant (. ) (Iverson 1982)

1982 
SHARP APL 
complex Floor, Ceiling, Modulus, Encode (McDonnell 1973)

1983 
SHARP APL 
Rank operator (⍤ ) (Whitney 1982) Left (⊣ ), Right (⊢ ), Conditional enclose/Link (⊃ )

1984 
APL2 
First (↑ ) and Mix (⊃ ) opposite to NARS, Partition (⊂ ), Enlist (∊ ), Find (⍷ ), Depth (≡ ), Index (⌷ ), selective assignment

1987 
SHARP APL 
Table (⍪ ) short left argument for Take, Drop

1989 
SHARP APL 
Nub Sieve (≠ ), Raze (↓ ) (A Dictionary of APL 1987)

2009 
NARS2000 
Function trains (proposed Iverson and McDonnell 1989; J 1990)

2010 
NARS2000 
Tally (> , changed to ≢ following Dyalog, 2011) (A+ 1988, J 1990)

2010 
NARS2000 
Indices (⍸ ) (K 1996, J 2003)

2011 
NARS2000 
Over (⍥ ) (SHARP (close) 1981)

2011 
NARS2000 
Square Root/Root (√ ) (proposed McDonnell 1986; J 1990)

2011 
Dyalog APL 
Key (⌸ ) (J 1990)

2014 
Dyalog APL 
2train as Atop (proposed Hui 2006; I 2012), major cell search (A+ 1988)

2017 
Dyalog APL 
At (@ ) (Scholes) Stencil (⌺ ) (from Cut: Rationalized APL 1983, J 1994) Interval Index (⍸ ) (A+ 1988, J 2006) Nest (⊆ ) (SHARP 1983)

2019 
dzaima/APL 
Reverse Compose (⍛ ) (I 2012, Extended Dyalog APL 2019)

2020 
Dyalog APL 
Atop (⍤ ) (SHARP (close) 1981), Constant (⍨ ) (I 2012)
