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- If-Then-Else
- Conditional expression.
- Usage
- If Then else
- Arguments
- pred (BOOL). Boolean expression which expresses the condition
e1 (T1). T1can be any type.
e2 (T2). T2can be any type.
- Returned Object
- Depending on the pred value, the object returned has the same type as either e1 or e2.
- Description
- This expression returns e1 if pred is True. It returns e2 otherwise.
- Side Effect
- Important: in the first version of AMAPmod, the evaluation procedure of expressions evaluates all subexpressions before evaluating a given expression. Thus, in every cases, both e1 and e2 are evaluated first. Then depending on the value of pred the evaluation of the If Then Else expression leads to select either e1 or e2. This means that some time may be lost in computing useless expressions. This behavior will be corrected in version 2.
- See Also
-
Array,
List,
Pos,
At,
Append.
Examples
AML> A = 3
<INT>
AML> If a == 3 Then "Yes" Else "No"
<STRING>Yes
AML> f(_x) = If _x == 3 Then "Yes" Else _x-1
<FUNC> Function
AML> f(2)
<INT> 1
AML> f(3)
<STRING> Yes
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