Maximum (Arraylist function)

From m204wiki
Jump to navigation Jump to search

Get number of maximum item (Arraylist class)

Maximum returns the number of the Arraylist item that has the maximum numeric value after the application of a specified function to each item. The function that gets applied to each Arraylist item, which you identify using the itemFunction argument, must be a method that operates on the item type and returns a User Language intrinsic datatype (Float, String, Longstring, or Unicode) value.


%number = al:Maximum[( [itemFunction])]

Syntax terms

%number A numeric variable to return the item number of the item in the indicated Arraylist that has the maximum value after the argument function is applied.
al An Arraylist object.
itemFunction A method value (a method name literal, a method variable, or even a method that returns a method value) for a method that operates on items of the type specified on the al declaration and that returns a numeric or string value.

As of Sirius Mods Version 7.6, the special identity function, This is the default itemFunction value for the Maximum and Minimum methods. See "Using the This function as the Maximum parameter" for more information.

Usage notes

  • If the function applied by Maximum returns string values, Maximum uses the decimal-equivalent value of the character bytes and determines the number of the item that has the greatest value. Lowercase letters are first ranked alphabetically; then uppercase letters, also ranked alphabetically; finally followed by the numbers; that is: 'a'..'z','A'..'Z',0..9.
  • If two or more Arraylist items have equal, maximum, values, Maximum returns the position of the item that appears closest to the beginning of the Arraylist.
  • The parameter for Maximum is a method value, not a User Language expression. That is, you cannot provide a function that itself has an argument (say, ToIntegerPower(2)) as the Maximum parameter. The "Maximum and Minimum with local method" example shows a way to apply ToIntegerPower with Maximum.
  • Maximum is available in Sirius Mods Version 7.3 and later.


Maximum and Minimum using Count function

In the following example, the Maximum and Minimum functions first apply the Stringlist Count function, then return the position of the Arraylist item Stringlist that has the most items and the one that has the fewest. The Stringlist List function simplifies the construction of the lists.

begin %list1 is object stringlist %list2 is object stringlist %list3 is object stringlist %list1 = List('the', 'quick', 'brown') %list2 = List('fox', 'jumped', 'over', 'the') %list3 = List('lazy', 'dog', 'yesterday', 'two', 'times') al is collection arraylist of object stringlist al = List(%list1, %list2, %list3) printText {~} is {al:maximum(count)} printText {~} is {al:minimum(count)} end

The result is:

al:maximum(count) is 3 al:minimum(count) is 1

Maximum and Minimum with local method

The local method used with Maximum in the following request applies ToIntegerPower, which (because it requires its own argument) the syntax of Maximum does not allow as a parameter.

begin %alist is collection arraylist of float %alist = List(10, -11, 0, 11) local function (float):Squared is float return %this:toIntegerPower(2) end function printText {~} is {%alist:maximum(Squared)} printText {~} is {%alist:minimum(Squared)} end

The result is:

%alist:maximum(Squared) is 2 %alist:minimum(Squared) is 3

Although applying the local method above to item 2 and item 4 produces the same value, Maximum returns the item that is closer to the beginning of the Arraylist.

See also

  • Minimum is the opposite of the Maximum function.