param

-wrong parameter ("arma3dev") defined!-[[:Category:Introduced with arma3dev version 1.47|1.47]]

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Description

Description:

Extracts a single value with given index from input argument, similar to BIS_fnc_param. When used without argument, as shown in main syntax, internal variable _this, which is usually available inside functions and event handlers, is used as argument. If input argument is not an array, it will be converted to 1 element array.

If extracted item of input with given index is undefined, of the wrong type or of the wrong length (if the item is an array), default value is used instead. To log these substitutes into .rpt file, set allowFunctionsLog param in description.ext to 1.

⚠

W.I.P.

Groups:

Uncategorised

Syntax

Syntax:

param [index, defaultValue, expectedTypes, expectedArrayLength]

Parameters:

[index, defaultValue, expectedDataTypes, expectedArrayLength]: Array

index: Number - index of required item in the input array.

defaultValue: Anything - a default value to return if input is undefined, of the wrong type or of the wrong length (if the item is an array).

expectedDataTypes (Optional): Array of direct Data Types - check if passed value is of listed Data Types. If not, use default value supplied. Empty array [] means every data type is accepted.

expectedArrayLength (Optional): Number - if passed value is array, check that it is of a certain length. If not, use default value supplied.

Return Value:

Anything - extracted value on success or default value otherwise. Nothing if syntax error occurred.

Alternative Syntax

Syntax:

argument param [index, defaultValue, expectedDataTypes, expectedArrayLength]

Parameters:

argument: Anything - A usual array of params is expected. If a non-array value is passed, it will be converted to 1 element array

[index, defaultValue, expectedDataTypes, expectedArrayLength]: Array

index: Number - index of required item in the input array.

defaultValue: Anything - a default value to return if input is undefined, of the wrong type or of the wrong length (if the item is an array).

expectedDataTypes (Optional): Array of direct Data Types - check if passed value is one of listed Data Types. If not, use default value supplied. Empty array [] means every data type is accepted.

expectedArrayLength (Optional): Number - if passed value is an array, check that it is of a certain length. If not, use default value supplied.

Return Value:

Anything - extracted value on success or default value otherwise. Nothing if syntax error occurred.

Examples

Example 1:

[1, 2, 3] call { private ["_one", "_two", "_three"]; _one = param [0, 1]; _two = param [1, 2]; _three = param [2, 3]; // ..... };

Example 2:

[123] call { private "_val"; _val = param [0, 0]; }; // Below would produce the same result as above 123 call { private "_val"; _val = param [0, 0]; };

Example 3:

_z = position player param [2, 0]; if (_z > 10) then { hint "YOU ARE FLYING!"; };

Example 4:

fnc = { private ["_pos", "_rad"] _pos = param [0, [0,0,0], [objNull, []], 3]; _rad = param [1, 0, [0]]; _pos nearObjects _rad; }; [position player, 25] call fnc; //ok [player, 25] call fnc; //ok [25, player] call fnc; //default values are used

Additional Information

See also:

See also needed

Notes

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[[Category:Introduced with arma3dev version 1.47]][[ Category: arma3dev: New Scripting Commands | PARAM]][[ Category: arma3dev: Scripting Commands | PARAM]]