Case.on - Revision history

Ximan: /* Example Usage */

2010-11-24T17:38:04Z

‎Example Usage

Ximan: /* Example Usage */

2010-11-02T23:46:49Z

‎Example Usage

Ximan: /* Calling Pattern */

2010-11-02T20:38:48Z

‎Calling Pattern

Ximan: Created page with "== Calling Pattern == Call local c = sl.case(casetable) -- later local r[,...] = c.on(sel, arg[, ...]) Args sel is any type, used as key to lookup in casetable Results r0......"

2010-11-02T20:37:34Z

Created page with "== Calling Pattern == Call local c = sl.case(casetable) -- later local r[,...] = c.on(sel, arg[, ...]) Args sel is any type, used as key to lookup in casetable Results r0......"

New page

== Calling Pattern ==
Call
local c = sl.case(casetable)
-- later
local r[,...] = c.on(sel, arg[, ...])
Args
sel is any type, used as key to lookup in casetable
Results
r0...rN are the indefinite results of applying arg1...argN to the value found in casetable

== Example Usage ==

local t =
{
[1] = function(...) local a={...} print('a') print(a[a[5] ]) end,
['1'] = function(...) local a={...} print('b') print(a[a[4] ]) end,
bye = function(...) local a={...} print('c') print(a[a[3] ]) end,
default = function(...) local a={...} print('d') print(a[a[2] ]) end,
}
local c = sl.case(t)
local z = 'bye'
c.on(z,2,3,4,5,6)

--> 'c'
--> 5

== Description ==

The method on searches for sel among the keys of casetable. If found and the associated value is a function, then the remaining variadic arguments arg0...argN (if any) are passed to that function and its results are returned as the results to the on invocation. If sel is found but the associated value is not a function, then the actual value is returned as the result of the on invocation. If sel isn't found, then a magic value, 'default' is searched for and if found then its associated value is treated in an identical manner.

== Upon Error ==

If neither the passed sel key or the magic 'default' key are found among the keys of casetable, then an error is reported and handled according to the operant error redirection mode.

== See Also ==

* [http://www.easyuo.com/openeuo/wiki/index.php/Simplelib simplelib]

* [[case]]

@@ Line 24: / Line 24: @@
   --> c
- --> 5
 == Description ==

@@ Line 23: / Line 23: @@
   c.on(z,2,3,4,5,6)
-  --> 'c'
+  --> c
   --> 5

@@ Line 6: / Line 6: @@
 Args
   sel is any type, used as key to lookup in casetable
 Results
-  r0...rN are the indefinite results of applying arg1...argN to the value found in casetable
+  r0...rN are the indefinite results of applying arg0...argN to the value found in casetable
 == Example Usage ==