Search ('all' for everything):
Search results:
Span
— span a set of characters
Index of Function Types:
affects &pos
character sets
co-expressions
control structures
file processing
generators
infix operations
keywords
lists, sets and tables
math
metadata
output formatting
pattern matching
prefix operations
records
strings
windows and keyboards
Index of Subsystems:
base
digitcnt.icn
SNOBOL4 functions
base
—
prefix operations
/x
check for null value
Description
/x : x
/
x
produces
x
if the value of
x
is the
null
value, but fails otherwise. It produces a variable if
x
is a variable.
Parameters
x
an expression or variable, which may be null.
returns
x
or
&null
