| defined |
(String name [, Object target]) |
reserved |
| defined |
(int index, Object target) |
|
| |
Looks for an existing definition, either in the current scope or in
target,
and returns
1
if the lookup succeeds and
0
otherwise.
A single argument asks
defined
to look through the current block and all enclosing blocks
for a definition of variable
name.
Two arguments asks whether the object at
index
in
target
is defined, or whether
target
contains a definition of
name.
| |
| Example: |
The program,
import yoix.stdio.*;
if (defined("ptr")) {
if (defined("total", ptr))
printf("ptr.total=%d\n", ptr.total);
else printf("ptr.total is not defined\n");
} else printf("ptr is not defined\n");
shows how you can find out if
ptr.total
exists, and if so print its value.
| | |
| Return: |
int
|
|
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|
