diff options
Diffstat (limited to 'txr.1')
| -rw-r--r-- | txr.1 | 31 |
1 files changed, 26 insertions, 5 deletions
@@ -31833,7 +31833,7 @@ by using .coNP Function @ nullify .synb -.mets (nullify << sequence ) +.mets (nullify << obj ) .syne .desc The @@ -31841,11 +31841,32 @@ The function returns .code nil if -.meta sequence +.meta obj is an empty sequence. -Otherwise it returns -.meta sequence -itself. +Otherwise, if +.meta obj +is not an empty sequence, or isn't a sequence, then +.meta obj +itself is returned. + +If +.meta obj +is a structure, then +.meta obj +is returned if it doesn't support the +.code nullify +method, even if it has other methods such as +.code length +by which it could be inferred that it represents an empty sequence. + +If +.meta obj +has a +.code nullify +method, then the +.code nullify +function invokes that method and returns whatever value +that method returns. Note: the .code nullify |