20,741
edits
Using Nasal functions: Difference between revisions
Jump to navigation
Jump to search
m
→Named arguments in function calls
| Line 180: | Line 180: | ||
Declared arguments are checked and defaulted as would be expected: it's an error if you fail to pass a value for an undefaulted argument, missing default arguments get assigned as usual, and any rest parameter (e.g. "func(a,b=2,rest...){}") will be assigned with an empty vector. | Declared arguments are checked and defaulted as would be expected: it's an error if you fail to pass a value for an undefaulted argument, missing default arguments get assigned as usual, and any rest parameter (e.g. "func(a,b=2,rest...){}") will be assigned with an empty vector. | ||
== Specifying parameters at call-time == | |||
The previously discussed syntax also makes it possible to have functions without any named function arguments in their signature, while specifying arguments only during invocation: | |||
<syntaxhighlight lang="php"> | |||
var print_pos = func { | |||
print('lat:',lat, ' lon:', lon, '\n'); | |||
} | |||
print_pos( lat:43.94, lon: 23.88); | |||
</syntaxhighlight> | |||
Note how the function's signature doesn't have any named parameters at all - instead, the function call sets up a hash that is added to the namespace during invocation. | |||
===Nested functions, implicit return === | ===Nested functions, implicit return === | ||