throw

1.001.001.501.000.50

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Description

Description:

Throws an exception. The exception is processed by first catch block. This command will terminate further execution of the code.

⚠

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.

Groups:

Program Flow

Syntax

Syntax:

throw expression

Parameters:

expression: Anything

Return Value:

Nothing

1.54

Alternative Syntax

Syntax:

if (condition) throw exception

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

Examples

Example 1:

try {throw "invalid argument"} catch {hint str _exception};

Example 2:

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; };

Additional Information

See also:

Exception handling try catch

Notes

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