param

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Syntax:: param [index, defaultValue, expectedDataTypes, expectedArrayCount]
Parameters:: [index, defaultValue, expectedDataTypes, expectedArrayCount]: Array
: index: Number - index of required item in the input array.
: defaultValue (Optional): 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 - checks if passed value is one of listed Data Types. If not, default value is used instead. Empty array [] means every data type is accepted.
: expectedArrayCount (Optional): Number or Array - a single size or array of sizes. If passed input value is an array, checks that it has a certain number of elements. If not, default value is used instead. Empty array [] means any size is accepted.
Return Value:: Anything - extracted value on success or default value otherwise. Nothing if syntax error occurred.

Syntax:: argument param [index, defaultValue, expectedDataTypes, expectedArrayCount]
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, expectedArrayCount]: Array
: index: Number - index of required item in the input array.
: defaultValue (Optional): 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 - checks if passed value is one of listed Data Types. If not, default value is used instead. Empty array [] means every data type is accepted.
: expectedArrayCount (Optional): Number or Array - a single size or array of sizes. If passed input value is an array, checks that it has a certain number of elements. If not, default value is used instead. Empty array [] means any size is accepted.
Return Value:: Anything - extracted value on success or default value otherwise. Nothing if syntax error occurred.

Example 1:: [1, 2, 3] call { private _one = param [0, 1]; private _two = param [1, 2]; private _three = param [2, 3]; // ... };
Example 2:: [123] call { private _val = param [0]; }; // Below would produce the same result as above 123 call { private _val = param [0]; };
Example 3:: _z = position player param [2, 0]; if (_z > 10) then { hint "YOU ARE FLYING!"; };
Example 4:: fnc = { private _pos = param [0, [0,0,0], [objNull, []], [2,3]]; private _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

See also:: params select set resize reverse in find findIf toArray toString forEach count deleteAt deleteRange append sort arrayIntersect splitString joinString isEqualTypeAll isEqualType isEqualTypeParams isEqualTypeArray isEqualTypeAny typeName BIS_fnc_param

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: Posted on November 8, 2016 - 07:50 (UTC)
Demellion: You can also use param in a complex with another commands. For example call, compile and format: ["var = 2"] call { call compile format ["%1", param [0,"",[""]]]; // compiled param string value hint str (var); // 2 };

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