GAP

GAP, aka Groups, Algorithms and Programming, is an open source programming language created in 1986 by gap.

Source code:

git clone https://github.com/gap-system/gap

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GAP (Groups, Algorithms and Programming) is a computer algebra system for computational discrete algebra with particular emphasis on computational group theory.. Read more on Wikipedia...

GAP website
GAP Wikipedia page
GAP is developed on GitHub and has 615 stars
There are at least 3,760 GAP repos on GitHub
GAP first developed in RWTH Aachen University
file extensions for GAP include g, gap, gd, gi and tst
GAP on Twitter
The Google BigQuery Public Dataset GitHub snapshot shows 4k users using GAP in 4k repos on GitHub
There are 33 Project Euler users using GAP
Explore GAP snippets on Rosetta Code
GAP on HOPL
Pygments supports syntax highlighting for GAP
GitHub supports syntax highlighting for GAP
gap-system.org was registered in 2000
See also: (3 related languages)C, Unix, Sage

Example from Riju:

Print("Hello, world!\n");

Example from Linguist:

gap> START_TEST("Test of factor groups and natural homomorphisms");

gap> G:=HeisenbergPcpGroup(2);
Pcp-group with orders [ 0, 0, 0, 0, 0 ]

gap> H:=Subgroup(G,[G.2,G.3,G.4,G.5]);
gap> K:=G/H;
gap> NaturalHomomorphism(K);

gap> A:=Subgroup(H, [G.3]);
Pcp-group with orders [ 0 ]
gap> B:=Subgroup(Subgroup(G,[G.1,G.4,G.5]), [G.4]);
Pcp-group with orders [ 0 ]
gap> Normalizer(A,B);
Pcp-group with orders [ 0 ]
gap> # The following used to trigger the error "arguments must have a common parent group"
gap> Normalizer(B,A);
Pcp-group with orders [ 0 ]


gap> STOP_TEST( "factor.tst", 10000000);

Example from Wikipedia:

gap> G:=SmallGroup(8,1); # Set G to be a group of order 8.
<pc group of size 8 with 3 generators>
gap> i:=IsomorphismPermGroup(G); # Find an isomorphism from G to a group of permutations
<action isomorphism>
gap> Image(i,G); # The image of G under I - these are the generators of im G.
Group([ (1,5,3,7,2,6,4,8), (1,3,2,4)(5,7,6,8), (1,2)(3,4)(5,6)(7,8) ])
gap> Elements(Image(i,G)); # All the elements of im G.
[ (), (1,2)(3,4)(5,6)(7,8), (1,3,2,4)(5,7,6,8), (1,4,2,3)(5,8,6,7), 
   (1,5,3,7,2,6,4,8), (1,6,3,8,2,5,4,7), (1,7,4,5,2,8,3,6), (1,8,4,6,2,7,3,5) ]

Feature	Supported	Token	Example
Line Comments	✓	#	# A comment
Comments	✓
Semantic Indentation	X

GAP - Programming language

Language features