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--- modding:function:and [2014/12/27 04:40] – external edit 127.0.0.1
+++ modding:function:and [2017/01/27 02:17] (current) – 0xabcdef
@@ Line 1: / Line 1: @@
-[[modding:function:and]]
+[[and Talk Page | Discuss this page]]
 === and ===
-[[modding:function:and]]
+See [[http://xelerus.de/index.php?s=functions&function=3 | and on Xelerus]]
-^ Syntax | (and exp1 exp2 ... expn) -> True/Nil |
+^ Syntax | (and exp1 [exp2 ... expn]) -> value/Nil |
-^ Arguments | exp1: an expression that evaluates to Nil or non-Nil |
+^ Arguments | exp1: an expression that evaluates to **Nil** or non-**Nil** |
-^ | exp2 ... expn: optional expressions that each evaluate to Nil or non-Nil. |
+^ | [exp2 ... expn]: optional expressions that each evaluate to **Nil** or non-**Nil**. |
-^ Returns | boolean: the result of anding all of the expressions |
+^ Returns | If all arguments return a non-**Nil** value, then returns the value of the last argument. Otherwise, returns **Nil**. If there is only one argument, then returns the value of that argument. |
-^ Category | [[logical operator]] |
+^ Category | [[logical operator functions | logical operator]] |
-^ Description | Returns True if all the expressions are not Nil otherwise returns Nil. |
+^ Description | Uses lazy evaluation, which means that it stops after it finds a **Nil** value or ends up evaluating every argument if all of them return a non-**Nil** value. |
 === Example ===
-<code lisp>(block (someCondition)
+<code>
-	(setq someCondition True)
+(and Nil (setq foo 100))
-	(and someCondition Nil)
+</code>
-	)</code>
+Returns **Nil**. Also, **foo** will not be set to 100
-This will return a Nil.
+<code>
+(and (setq foo 200) Nil (setq bar "baz"))
+</code>
+Returns **Nil**. Also, **foo** will be set to **200** and **bar** will not be set to **"baz"**
+<code>
+(and (gr (count (setq foo (list Nil Nil Nil))) 2) 5)
+</code>
+Returns **5**. Also, **foo** will be set to **(Nil Nil Nil)**
+<code>
+(and (setq foo Nil) (setq bar True))
+</code>
+Returns **Nil**. Also, **foo** will be set to **Nil** and **bar** will not be set to **True**
 Return to [[:Functions]] list