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| <span style="font-size:120%; color:black"><b><section begin=dpl_desc/>Find matching list ite<section end=dpl_desc/></b></span>
| | #REDIRECT [[FindPreviousItem (GenericNamedArraylist function)]] |
| [[Category:FloatNamedArraylist methods|FindPreviousItem function]]
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| <!--DPL?? Category:FloatNamedArraylist methods|FindPreviousItem function: Find matching list ite-->
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| <p>
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| FindPreviousItem is a member of the [[FloatNamedArraylist class]].
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| </p>
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| This function searches “backward” in the FloatNamedArraylist to find and return
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| the next item that matches a specified criterion.
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| The criterion is supplied by the [[SelectionCriterion class|SelectionCriterion]] object
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| that is a required FindPreviousItem parameter.
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| If no item satisfies the criterion,
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| the request is cancelled and an ItemNotFound exception ([[??]] refid=itemnfe.)
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| is thrown.
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| FindPreviousItem is available in ''Sirius Mods'' version 7.6 and later.
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| ==Syntax==
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| %item = %fnamrayl:FindPreviousItem(criterion -
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| [, Start=itemnum])
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| ===Syntax Terms===
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| <dl>
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| <dt><i>%item</i>
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| <dd>A variable of the type of the items in the FloatNamedArraylist to contain the
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| item that is located by the search.
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| <dt><i>%fnamrayl</i>
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| <dd>A FloatNamedArraylist object.
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| <dt><i>criterion</i>
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| <dd>A SelectionCriterion object, which is a relational expression that is
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| applied to a ''%fnamrayl'' item value to determine
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| whether the value satisfies the expression.
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| The expression consists of a function, an operator, and a numeric or string value.
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| For example, <tt>LT(this, 11)</tt> is the
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| criterion <tt>this</tt> <tt><</tt> <tt>11</tt>, where
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| <tt>this</tt> is an identity function that simply returns the item's value.
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| The first item tested by FindPreviousItem that satisfies this expression is
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| the method's return value.
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| The function in the criterion is
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| a method value (a method or class member name literal, or a method variable)
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| for a method
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| that operates on items of the type specified on the ''%fnamrayl''
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| declaration and that returns a numeric or string value.
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| This is described further in "[[SelectionCriterion class#Specifying a SelectionCriterion's parameters|Specifying a SelectionCriterion's parameters]]".
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| <dt><b>Start=</b><i> itemnum</i>
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| <dd>The number of the item ''before'' which to begin the search.
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| If the ''itemnum'' value of Start is 4, item 3 is the first item considered.
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| The value of Start may be 1 through one plus the number of items in
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| the FloatNamedArraylist.
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| For a collection of three items, ''itemnum'' may be 1, 2, 3, or 4.
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| This is an optional argument, and it defaults to one plus the number of items in
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| the FloatNamedArraylist.
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| If you specify a value, the parameter name <tt>Start</tt> is required.
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| </dl>
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| ==Usage Notes==
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| <ul>
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| <li>If the value of Start is not in the range of 1 through one plus the number
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| of items in the FloatNamedArraylist, the request is cancelled.
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| If the value of Start is 1, no item can be found and
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| the request is cancelled, but an ItemNotFound exception is thrown.
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| <li>[[FindNextItem (FloatNamedArraylist function)|FindNextItem]]
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| is identical to FindPreviousItem except that it searches forward
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| in the FloatNamedArraylist.
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| </ul>
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| ==Examples==
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| In the following fragment, a FindPreviousItem call is applied to a
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| FloatNamedArraylist
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| of objects of the <tt>annual</tt> class that is defined in the
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| request in the "[[Minimum (FloatNamedArraylist function)#Examples|FloatNamedArraylist Minimum function example]]".
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| <pre style="xmp">
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| %fann is floatnamedArraylist of object annual
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| %fann = new
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| %fann(12) = newa(621, 650)
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| %fann(14) = newa(334, 343)
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| %fann(15) = newa(288, 276)
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| %fann(13) = newa(141, 182)
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| %fann(11) = newa(131, 115)
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| %sel is object selectionCriterion for object annual
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| %sel = LT(chg, 0)
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| %ann is object annual
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| %ann = %fann:findPreviousItem(%sel, start=4)
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| print %ann:myprint
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| </pre>
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| The result is:
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| <pre style="xmp">
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| ybegin=131, yend=115
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| </pre>
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