throw: Difference between revisions

Revision as of 02:11, 7 February 2021

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Groups:: Program Flow

Syntax:: if (condition) throw exception Template:Since
Parameters:: if (condition): If Type - if (condition) returns true, "exception" is thrown
: exception: Anything - value that will be put into _exception variable inside catch block
Return Value:: Nothing

Example 1:: try {throw "invalid argument"} catch {hint str _exception};
Example 2:: Template:Since: 123 try {if (_this != 123) throw "invalid argument"} catch {hint str _exception};
Example 3:: The correct usage of shorthand alt syntax: try { if (a > b) throw "Error: some error"; // OK // The command argument is static } catch { hint str _exception; }; try { _someFunc = { ..... }; if (a > b) throw (call _someFunc); // NOT OK // The command argument is dynamic // _someFunc is called first to get the value regardless of (a > b) outcome } catch { hint str _exception; }; try { _someFunc = { ..... }; if (a > b) then {throw (call _someFunc)}; /// OK // The command argument is dynamic // _someFunc is only called when (a > b) is true } catch { hint str _exception; };

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 | Throws an exception. The exception is processed by first [[catch]] block. This command will terminate further execution of the code.
-{{Important | Avoid using alternative shorthand syntax if you are planning on preparing your exception information dynamically, as it will have to be generated first regardless of the condition of the [[if]] statement before it, as shown in Example 3.}}
+{{Feature | important | Avoid using alternative shorthand syntax if you are planning on preparing your exception information dynamically, as it will have to be generated first regardless of the condition of the [[if]] statement before it, as shown in Example 3.}}
 |s1= [[throw]] expression