Empty string: Difference between revisions
Add lang example
(Add lang example) |
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Line 1,792:
'{= {S.length {emptyString}} 0}
-> true
</syntaxhighlight>
=={{header|Lang}}==
In lang strings are called text and are of type TEXT.
<syntaxhighlight lang="lang">
# Text creation
# Empty text escape sequence
$s = \e
$s = {{{}}}
# With simple assignment:
$s=
# "$s =" would not work, as ist would set $s to null
# Is empty
fn.println(parser.con($s == \e))
fn.println(parser.con($s === \e))
fn.println(parser.con(!$s))
fn.println(fn.conNot($s))
fn.println(parser.con(fn.strlen($s) == 0))
fn.println(parser.con(fn.len($s) == 0))
fn.println(parser.op(@$s == 0))
# Is not empty
fn.println(parser.con($s != \e))
fn.println(parser.con($s !== \e))
fn.println(parser.con($s)) # Must be used in conditional parsing mode (Execution parsing mode would return $s as is)
fn.println(fn.bool($s))
fn.println(parser.con(fn.strlen($s) > 0))
fn.println(parser.con(fn.len($s) > 0))
fn.println(parser.op(@$s > 0))
</syntaxhighlight>
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