Comparison of programming languages (array)

This comparison of programming languages (array) compares the features of array data structures or matrix processing for various computer programming languages.

Syntax

Array dimensions

The following list contains syntax examples of how to determine the dimensions (index of the first element, the last element or the size in elements).

Some languages index from zero. Some index from one. Some carry no such restriction, or even allow indexing by any enumerated type, not only integers.

Languages	Size	First	Last
Ada	name'Length	name'First	name'Last
ALGOL 68	UPB name - LWB name+1 2 UPB name - 2 LWB name+1 etc.	LWB name 2 LWB name etc.	UPB name 2 UPB name etc.
APL	⍴ name (⍴ name)[index]	⎕IO	(⍴ name)-~⎕IO (⍴ name)[index]-~⎕IO
AWK	length	1	asorti
C#, Visual Basic (.NET), Windows PowerShell, F#	name.Length	name.GetLowerBound(dimension)	name.GetUpperBound(dimension)
CFML	arrayLen(name) name.len()	1	name.len()
Ch	max(shape(name))	0	max(shape(name))-1
Common Lisp	(length name)	0	(1- (length name))
D	name.length	0	name.length-1 $-1
Fortran	size(name)	lbound(name)	ubound(name)
Go	len(name)	0	len(name) - 1
Haskell	rangeSize (bounds name)	fst (bounds name)	snd (bounds name)
ISLISP	(length name)	0	(1- (length name))
Icon	*name	1	*name
Cobra, D, Haxe, Java, JavaScript, Scala	name.length	0	name.length - 1
J	#name	0	<:@#name
JavaScript (ES2022)	name.length	0 name.at(0)[1]	name.length - 1 name.at(-1)[1]
Julia	length(name) size(name)	begin first.(axes(name))	end last.(axes(name))
Lingo	count(name)	1	getLast(name)
LiveCode	length(name)	1 first	-1 last
Lua	#name	1 by convention; any integer[2]	#name
Mathematica	Length[name]	1 First[name]	-1 Last[name]
MATLAB, GNU Octave	length(name)	1	end
Nim	name.len	name.low[3]	name.high
Oberon	LEN(name)	0	LEN(name) - 1
Object Pascal	Length(name)	0 low(name)	Length(name)-1 high(name)
Objective-C (NSArray * only)	[name count]	0	[name count] - 1
OCaml	Array.length name	0	Array.length name - 1
Perl	scalar(@name)	$[	$#name
PHP	count(name)	0	count(name) - 1
PL/I	dim(name[,dim])	lbound(name[,dim])	hbound(name[,dim])
Python	len(name)	0	-1 len(name) - 1
R	length(name)	1	length(name)
Raku	@name.elems	0	@name.end
Red	length? name	name/1 first name	last name
Ruby	name.size	0 name.first	-1 name.size - 1 name.last
Rust	name.len()	0	name.len() - 1
S-Lang	length(name)	0	-1 length(name)-1
Scheme	(vector-length vector)	0	(- (vector-length vector) 1)
Smalltalk	name size	1 name first	name size name last
Swift	name.count	0	name.count - 1
Unicon	*name	1	*name
Visual Basic	UBound(name)-LBound(name)+1	LBound(name)	UBound(name)
Wolfram Language	Length[name]	1 First[name]	-1 Last[name]
Xojo	UBound(name)	0	UBound(name)
XPath/XQuery	count($name)	1	count($name) last() array:size(name)[4]

Indexing

The following list contains syntax examples of how to access a single element of an array.

Format	Languages
name[index] or name[index1, index2] etc.	ALGOL 58, ALGOL 60, ALGOL 68, AWK, Julia, Modula, Pascal, Object Pascal, C#, S-Lang[5] Icon, Unicon
name[index] or name[index1; index2] etc. or index⌷name or index1 index2⌷name etc.	APL
name[index]	ActionScript, C, CFML, Ch, Cobra, C++, D, Go, Haxe, Java, JavaScript, Lingo, Lua, Nim, Objective-C (NSArray *), Perl,[5] PHP, Python,[5] R, Ruby,[5] Rust, Swift
$name[index]	Perl,[5] Windows PowerShell,[5] XPath/XQuery[4]
@name[index]	Raku
name(index) or name(index1, index2) etc.	Ada, ALGOL W, BASIC, COBOL, Fortran, RPG, GNU Octave, MATLAB, PL/I, Scala, Visual Basic, Visual Basic (.NET), Xojo
$name(index)	XPath/XQuery[4]
name.(index)	OCaml
name.[index]	F#, OCaml
name/index	Red
name ! index	Haskell
$name ? index	XPath/XQuery[4]
(vector-ref name index)	Scheme
(aref name index)	Common Lisp
(elt name index)	ISLISP
name[[index]]	Mathematica,[5] Wolfram Language
name at:index	Smalltalk
[name objectAtIndex:index]	Objective-C (NSArray * only)
index{name	J
name.item(index) or name @ index[6]	Eiffel

Slicing

The following list contains syntax examples of how a range of element of an array can be accessed.

In the following table:

• first – the index of the first element in the slice
• last – the index of the last element in the slice
• end – one more than the index of last element in the slice
• len – the length of the slice (= end - first)
• step – the number of array elements in each (default 1)

Format	Languages
name[first:last]	ALGOL 68,[7] Julia, Icon, Unicon
name[first+(⍳len)-⎕IO]	APL
name[first:end:step]	Python[8][9]
name[first:end]	Go
name[first..last]	Pascal, Object Pascal, Delphi, Nim
$name[first..last]	Windows PowerShell
@name[first..last]	Perl[10]
name[first..last] name[first...end] name[first, len]	Ruby[9]
copy/part skip name first len	Red
name(first..last)	Ada[7]
name(first:last)	Fortran,[7][8] GNU Octave, MATLAB[7][10]
name[[first;;last;;step]]	Mathematica,[7][8][9] Wolfram Language
name[[first:last]]	S-Lang[7][8][10]
name.[first..step..last]	F#
name.slice(first, end)	Haxe, JavaScript, Scala
name.slice(first, len)	CFML
array_slice(name, first, len)	PHP[9]
(subseq name first end)	Common Lisp
(subseq name first end)	ISLISP
Array.sub name first len	OCaml
[name subarrayWithRange:NSMakeRange(first, len)]	Objective-C (NSArray * only)
(first([+i.@(-~)end){name	J
name[first..<end] name[first...last]	Swift
name copyFrom: first to:last name copyFrom: first count:len	Smalltalk
name[first..end]	D, C#[11][12]
name[first..end] name[first..=last]	Rust
name[first:end]	Cobra
table.move(name, first, last, 1, {})	Lua[13]

Array system cross-reference list

Language	Default base index	Specifiable index type[14]	Specifiable base index	Bound check	Multidimensional	Dynamically-sized	Vectorized operations
Ada	index type[15]	yes	yes	checked	yes	init[16]	some, others definable[17]
ALGOL 68	1	no[18]	yes	varies	yes	yes	user definable
APL	1	?	0 or 1[19]	checked	yes	yes	yes
AWK	1	yes, implicitly	no	unchecked	yes, as delimited string	yes, rehashed	no
BASIC	0	?	no	checked	no	init[16]	?
C	0	no	no[20]	unchecked	partially	init,[16][21] heap[22]	no
Ch	0	no	no	checked	yes, also array of array[23]	init,[16][21] heap[22]	yes
C++[17]	0	no	no[20]	unchecked	yes, also array of array[23]	heap[22]	no
C#	0	no	partial[24]	checked	yes	heap[22][25]	yes (LINQ select)
CFML	1	no	no	checked	yes, also array of array[23]	yes	no
COBOL	1	no[26]	no	checked	array of array[23][27]	no[28]	some intrinsics
Cobra	0	no	no	checked	array of array[23]	heap	?
Common Lisp	0	?	no	checked[29]	yes	yes	yes (map or map-into)
D	0	yes[30]	no	varies[31]	yes	yes	?
F#	0	no	partial[24]	checked	yes	heap[22][25]	yes (map)
FreeBASIC	0	no	yes	checked	yes	init,[16] init[32]	?
Fortran	1	yes	yes	varies[33]	yes	yes	yes
FoxPro	1	?	no	checked	yes	yes	?
Go	0	no	no	checked	array of array[23]	no[34]	no
Hack	0	yes	yes	checked	yes	yes	yes
Haskell	0	yes[35]	yes	checked	yes, also array of array[23]	init[16]	?
IDL	0	?	no	checked	yes	yes	yes
ISLISP	0	?	no	checked	yes	init[16]	yes (map or map-into)
J	0	?	no	checked	yes	yes	yes
Java[17]	0	no	no	checked	array of array[23]	init[16]	?
JavaScript	0	no	no	checked[36]	array of array[23]	yes	yes
Julia	1	yes	yes	checked (can be skipped locally; or globally by user)	yes, also array of array	yes	yes
Lingo	1	?	?	unchecked	yes	yes	yes
Lua	1	?	partial[37]	checked	array of array[23]	yes	?
Mathematica	1	no	no	checked	yes	yes	yes
MATLAB	1	?	no	checked	yes[38]	yes	yes
Nim	0	yes[3]	yes	optional[39]	array of array[23]	yes	yes[40]
Oberon	0	?	no	checked	yes	no	?
Oberon-2	0	?	no	checked	yes	yes	?
Objective-C[17]	0	no	no	checked	array of array[23]	yes	no
OCaml	0	no	no	checked by default	array of array[23]	init[16]	?
Pascal, Object Pascal	index type[15]	yes	yes	varies[41]	yes	varies[42]	some
Perl	0	no	yes ($[)	checked[36]	array of array[23]	yes	no[43]
Raku	0	no	no	checked[36]	yes	yes	yes
PHP	0	yes[44]	yes[44]	checked[44]	yes	yes	yes
PL/I	1	yes	yes	optional	yes	no	yes[45]
Python	0	no	no	checked	array of array[23]	yes	no[46]
RPG	1	no	no	?	no	no	?
R	1	?	no	unchecked	yes, also array of array	yes	yes
Ring	1	?	partial[37]	checked	array of array[23]	yes	?
Ruby	0	no	no	checked[36]	array of array[23]	yes	?
Rust	0	no	no	checked	array of array[23]	no	?
Sass	1	no	no	checked	array of array[23]	init[31]	?
S-Lang	0	?	no	checked	yes	yes	yes
Scala	0	no	no	checked	array of array[23]	init[16]	yes (map)
Scheme	0	?	no	checked	array of array[23]	init[16]	yes (map)
Smalltalk[17]	1	?	no	checked	array of array[23]	yes[47]	?
Swift	0	no	no	checked	array of array[23]	yes	?
Visual Basic (classic)	0, 1, or index type[48]	no	yes	checked	yes	yes	?
Visual Basic (.NET)	0 or index type[48]	no	partial[24]	checked	yes	yes	yes (LINQ select)
Wolfram Language	1	no	no	checked	yes	yes	yes
Windows PowerShell	0	no	no	checked	yes	heap	?
Xojo	0	no	no	checked	yes	yes	no
XPath/XQuery	1	no	no	checked	array of array[4][23]	yes	yes

Vectorized array operations

Some compiled languages such as Ada and Fortran, and some scripting languages such as IDL, MATLAB, and S-Lang, have native support for vectorized operations on arrays. For example, to perform an element by element sum of two arrays, a and b to produce a third c, it is only necessary to write

c = a + b

In addition to support for vectorized arithmetic and relational operations, these languages also vectorize common mathematical functions such as sine. For example, if x is an array, then

y = sin (x)

will result in an array y whose elements are sine of the corresponding elements of the array x.

Vectorized index operations are also supported. As an example,

even = x(2::2);
odd = x(::2);

is how one would use Fortran to create arrays from the even and odd entries of an array. Another common use of vectorized indices is a filtering operation. Consider a clipping operation of a sine wave where amplitudes larger than 0.5 are to be set to 0.5. Using S-Lang, this can be done by

y = sin(x);
y[where(abs(y)>0.5)] = 0.5;

Mathematical matrix operations

Language/ Library	Create	Determinant	Transpose	Element	Column	Row	Eigenvalues
APL	m←dims⍴x11 x12 ...	-.×m	⍉m	m[i;j] or i j⌷m	m[;j] or j⌷[2]m or j⌷⍤1⊢m or j⌷⍉m	m[i;] or i⌷m	⌹⍠1⊢m
Fortran	m = RESHAPE([x11, x12, ...], SHAPE(m))		TRANSPOSE(m)	m(i,j)	m(:,j)	m(i,:)
Ch[49]	m = {...}	determinant(m)	transpose(m)	m[i-1][j-1]	shape(m,0)	shape(m,1)	eigen(output, m, NULL)
Julia and its standard library LinearAlgebra	m = [1 2; 3 4] or m = [ 1 2 3 4 ]	det(m)	transpose(m) or m' for real matrices	m[i, j]	m[:, j]	m[i, :]	eigen(m).values
Mathematica / Wolfram Language	{{x11, x12, ...}, ...}	Det[m]	Transpose[m]	m[[i,j]]	m[[;;,j]]	m[[i]]	Eigenvalues[m]
MATLAB / GNU Octave	m = [...]	det(m)	m.'	m(i,j)	m(:,j)	m(i,:)	eig(m)
NumPy	m = mat(...)	linalg.det(m)	m.T	m[i-1,j-1]	m[:,j-1]	m[i-1,:]	linalg.eigvals(m)
R	m <- matrix(...) or m <- array(...)	det(m)	t(m)	m[i, j]	m[, j]	m[i, ]	eigen(m)
S-Lang	m = reshape([x11, x12, ...], [new-dims])		m = transpose(m)	m[i,j]	m[*,j]	m[j,*]
SymPy	m = Matrix(...)	m.det()	m.T	m[i-1,j-1]	m.col(j-1)	m.row(i-1)	m.eigenvals()