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=== and ===

See [[http://xelerus.de/index.php?s=functions&function=3 | and on Xelerus]]

^ Syntax | (and exp1 [exp2 ... expn]) -> value/Nil |
^ Arguments | exp1: an expression that evaluates to **Nil** or non-**Nil** |
^ | [exp2 ... expn]: optional expressions that each evaluate to **Nil** or non-**Nil**. |
^ 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 functions | logical operator]] |
^ 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>
(and Nil (setq foo 100))
</code>
Returns **Nil**. Also, **foo** will not be set to 100

<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**

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