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Idiomatically determine all the characters that can be used for symbols: Difference between revisions
Idiomatically determine all the characters that can be used for symbols (view source)
Revision as of 20:19, 15 January 2021
, 3 years ago→{{header|Nim}}
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Kotlin Identifier ignorable: [0][1][2][3][4][5][6][7][8][14][15][16][17][18][19][20][21][22][23][24][25][26][27][127][128]...
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=={{header|Nim}}==
As regards identifiers, there exists a general rule which describes how they can be formed. For this rule, the following program prints the allowed starting characters and the allowed characters:
<lang Nim>import sequtils, strutils
echo "Allowed starting characters for identifiers:"
echo toSeq(IdentStartChars).join()
echo ""
echo "Allowed characters in identifiers:"
echo toSeq(IdentChars).join()</lang>
{{out}}
<pre>Allowed starting characters for identifiers:
ABCDEFGHIJKLMNOPQRSTUVWXYZ_abcdefghijklmnopqrstuvwxyz
Allowed characters in identifiers:
0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ_abcdefghijklmnopqrstuvwxyz</pre>
But Nim is a lot more flexible and allows using Unicode symbols in identifiers provided these are letters and digits. Thus, the following program is valid:
<lang Nim>var à⁷ = 3
echo à⁷</lang>
Using escape character <code>`</code>, it is possible to override the rules and to include any character in an identifier and even to use a keyword as identifier. Here is an example of the possibilities:
<lang Nim>var `const`= 3
echo `const`
proc `<`(a, b: int): bool =
echo a, " ", b
system.`<`(a, b)
echo 4 < 7
proc `Π`(a: varargs[int]): int =
result = 1
for n in a: result *= n
echo Π(4, 5, 7)
var `1` = 2
echo `1`
</lang>
=={{header|Ol}}==
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