modding:function:or
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or
| Syntax | (or exp1 [exp2 … expn]) → value/Nil | |
|---|---|---|
| Arguments | exp1: An expression that evaluates to Nil or something else | |
| [exp2 … expn] | Additional values | |
| Category | logical operator | |
| Returns | The value of the first expression that does not return Nil, or Nil if there is none |
or |
| Description | Uses lazy evaluation, which means that it stops after it finds a non-Nil argument or ends up evaluating every argument if all of them return Nil |
|---|
Example
(or 1 2 3 4 5 (setq foo 6))
This will return 1 and foo will not be set to 6.
(or Nil (eq (setq foo "bar") "baz") "qux")
Returns “qux” and foo will be set to “bar”
(errblock (error b) (setq b (or c 0)) b )
If c has not been bound anything, then this code will return the error No binding for symbol [c] ### (or c 0) ### since errors are not Nil. Beware of bad code when using errBlock, as or will simply evaluate the thrown errors as true
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modding/function/or.1485389539.txt.gz · Last modified: 2017/01/26 00:12 by 0xabcdef