if

1.85

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Description

Description:

The standard if, then, else construct available in many languages. This syntax however has alternate forms in the manner of an Array.

• if (condition) then { code } else { code }
• if (condition) then [ { code }, { code } ]

Result of the Code executed is returned as the result to this command (which may be Nothing}.

Groups:

Uncategorised

Syntax

Syntax:

Anything = if (condition) then { Code } else { Code }

Parameters:

condition: Boolean expression. If it evaluates as 'true', the 'then' clause is executed. Otherwise, the 'else' clause (if present) is executed.

Return Value:

If Type - Predicate which will execute 1st or 2nd option when used. This predicate is used in then or exitWith commands.

Alternative Syntax

Syntax:

Anything = if (condition) then [ { ThenCode } , { ElseCode } ]

Parameters:

condition: Boolean expression. If it evaluates as 'true', the 'then' clause is executed. Otherwise, the 'else' clause (if present) is executed.

Return Value:

If Type - Predicate which will execute 1st or 2nd option when used. This predicate is used in then or exitWith commands.

Examples

Example 1:

_retVal = if (1 > 0) then { "It's true" } else { "It's false" }; hint str _retVal

Example 2:

_val = if (true) then [ { "true" }, { "false" } ]; hint _val;

Additional Information

See also:

elseexitWiththenControl Structures

Notes

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Notes

Posted on Jan 31, 2007 - 04:08

Ceeeb

Any _local variables you declare within the body of an if/then statement (ie between the curly braces) are local to that 'if' statement, and are destroyed at the end of the statement. If you know you want to use the variable outside the 'if' statement, make sure your declare it before the 'if' statement.

Posted on Jan 17, 2010 - 02:40

Galzohar

(A2 1.05) If the condition is nil then neither the "then" nor the "else" section get executed, but the script will proceed with no error messages.

Example code: hint "script started"; //will get executed if (nil) then { hint "true"; // will never get executed } else { hint "false"; // will never get executed }; sleep 3; hint "script ended"; //will get executed

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Posted on June 5, 2015 - 09:35 (UTC)

AgentRevolution

If you only need to choose between 2 raw values, it is possible to use the following trick to avoid using code blocks, as required by the if command, which results in greater atomicity and faster execution: _result = [falseValue, trueValue] select condition; The select command treats "false" as 0 and "true" as 1, therefore you can feed it a condition determining the array index of the value to be returned. Here is another example: _result = [1,-1] select (_this < 0); // If _this is less than 0, _result will be equal to -1, otherwise it will be 1 This feature was added in Arma 3.