FindNextItemNumber (Arraylist function): Difference between revisions

From m204wiki
Jump to navigation Jump to search
m (1 revision)
 
(14 intermediate revisions by 6 users not shown)
Line 1: Line 1:
{{Template:Arraylist:FindNextItemNumber subtitle}}
{{Template:Arraylist:FindNextItemNumber subtitle}}
 
<var>FindNextItemNumber</var> searches "forward" in the <var>Arraylist</var> to find and return the item number of the next item that matches a specified criterion.  The criterion is supplied by the <var>[[SelectionCriterion class|SelectionCriterion]]</var> object that is a required <var>FindNextItemNumber</var> parameter. If no item satisfies the criterion, the method returns a zero.
<var>FindNextItemNumber</var> searches "forward" in the <var>Arraylist</var> to find and return the item number of the next item that matches a specified criterion.  The criterion is supplied by the [[SelectionCriterion class|SelectionCriterion]] object that is a required <var>FindNextItemNumber</var> parameter. If no item satisfies the criterion, the method returns a zero.


==Syntax==
==Syntax==
{{Template:Arraylist:FindNextItemNumber syntax}}
{{Template:Arraylist:FindNextItemNumber syntax}}
===Syntax terms===
===Syntax terms===
<table class="syntaxTable">
<table class="syntaxTable">
<tr><th>%number</th>
<tr><th>%number</th>
<td>A numeric variable to return the item number of the item that is located by the search. </td></tr>
<td>A numeric variable to return the item number of the item that is located by the search. </td></tr>
<tr><th>al</th>
<tr><th>al</th>
<td>An <var>Arraylist</var> object. </td></tr>
<td>An <var>Arraylist</var> object. </td></tr>
<tr><th>selectionCriterion</th>
<tr><th>selectionCriterion</th>
<td>A <var class="term">[[SelectionCriterion class|selectionCriterion]]</var> object, which is a relational expression that is applied to an <var class="term">al</var> item value to determine whether the value satisfies the expression. The expression consists of a function, an operator, and a numeric or string value.<p>For example, <code>GT(this, -11)</code> is the criterion <code>this > -11</code>, where <code var ="term">this</code> is an identity function that simply returns the item's value. The first item tested by <var>FindNextItemNumber</var> that satisfies this expression is the method's return value.</p><p>The function in the criterion is a method value (a method or class member name literal, or a method variable) for a method that operates on items of the type specified on the <var class="term">al</var> declaration and that returns a numeric or string value. This is described further in [[SelectionCriterion class#Specifying a SelectionCriterion's parameters|Specifying a SelectionCriterion's parameters]].</p></td></tr>
<td>A <var>[[SelectionCriterion class|selectionCriterion]]</var> object, which is a relational expression that is applied to an <var class="term">al</var> item value to determine whether the value satisfies the expression. The expression consists of a function, an operator, and a numeric or string value.<p>For example, <code>GT(this, -11)</code> is the criterion <code>this > -11</code>, where <code var ="term">this</code> is an identity function that simply returns the item's value. The first item tested by <var>FindNextItemNumber</var> that satisfies this expression is the method's return value.</p>
<tr><th>Start</th>
<p>
<td>The <var class="term">number</var> of the item <b><i>after</i></b> which to begin the search. If the <var class="term">number</var> value of Start is 2, item 3 is the first item considered. The value of <var class="term">Start</var> may be 0 through the number of items in the collection. For a collection of three items, <var class="term">number</var> may be 0, 1, 2, or 3.<p>The default value for <var>Start</var> is <code>0</code>; to start from the first item in <var class="term">al</var>.</p><p>This is an optional, but <var>[[Methods#Named parameters|NameRequired]]</var>, argument; if you specify a value, the parameter name <var class="term">Start</var> is required.</p></td></tr>
The function in the criterion is a method value (a method or class member name literal, or a method variable) for a method that operates on items of the type specified on the <var class="term">al</var> declaration and that returns a numeric or string value. This is described further in [[SelectionCriterion class#Specifying a SelectionCriterion's parameters|"Specifying a SelectionCriterion's parameters"]].</p></td></tr>
 
<tr><th><var>Start</var></th>
<td>The <var class="term">number</var> of the item <b><i>after</i></b> which to begin the search. If the <var class="term">number</var> value of Start is 2, item 3 is the first item considered. The value of <var>Start</var> may be 0 through the number of items in the collection. For a collection of three items, <var class="term">number</var> may be 0, 1, 2, or 3.
<p>
The default value for <var>Start</var> is <code>0</code>; to start from the first item in <var class="term">al</var>.</p><p>This is an optional, but [[Notation conventions for methods#Named parameters|name required]], argument; if you specify a value, the parameter name <var>Start</var> is required.</p></td></tr>
</table>
</table>


==Usage notes==
==Usage notes==
<ul>
<ul>
<li>If the value of <var>start</var> is greater than the number of items in the <var>Arraylist</var>, the request is cancelled. If the value of <var>start</var> is equal to the number of items, <var>FindNextItemNumber</var> returns a zero.
<li>If the value of <var>start</var> is greater than the number of items in the <var>Arraylist</var>, the request is cancelled. If the value of <var>start</var> is equal to the number of items, <var>FindNextItemNumber</var> returns a zero.</li>
<li><var>FindNextItemNumber</var> is available in <var classs="product">Sirius Mods</var> version 7.6 and later.
 
<li><var>FindNextItemNumber</var> is available in <var class="product">[[Sirius Mods|Sirius Mods]]</var> Version 7.6 and later.</li>
 
<li>If one is only looking for the first or only item that matches that selection criteria and one doesn't care about the item number of the matching item, <var>[[FindNextItem (Arraylist function)|FindNextItem]]</var> might be a better method to use than <var>FindNextItemNumber</var>.
</ul>
</ul>


==Examples==
==Examples==
<ol><li>
The following request contains two <var>FindNextItemNumber</var> calls, one with a simple selection criterion and one with a compound criterion:
The following request contains two <var>FindNextItemNumber</var> calls, one with a simple selection criterion and one with a compound criterion:
<p class="code">begin
<p class="code">begin
<p class="code">%al is  arraylist of float
%al is  arraylist of float
%al = list(111, 29, 0, 93, 77, -345)
%al = list(111, 29, 0, 93, 77, -345)
 
%sel1 is object selectioncriterion for float
%sel1 is object [[SelectionCriterion class|selectionCriterion]] for float
%sel2 is object selectioncriterion for float
%sel2 is object selectioncriterion for float
%sel1 = GT(this, 100)
%sel1 = GT(this, 100)
%sel2 = AND(GE(this, 53), LT(this, 93))
%sel2 = AND(GE(this, 53), LT(this, 93))
 
printtext {~} is: {%al:findNextItemNumber(%sel1, start=1)}
[[PrintText statement|printText]] {~} is: {%al:findNextItemNumber(%sel1, start=1)}
printtext {~} is: {%al:findNextItemNumber(%sel2)}
printtext {~} is: {%al:findNextItemNumber(%sel2)}
</p>
end
end
</p>
</p>
Line 44: Line 52:
<p class="output">%al:findNextItemNumber(%sel1, start=1) is: 0
<p class="output">%al:findNextItemNumber(%sel1, start=1) is: 0
%al:findNextItemNumber(%sel2) is: 5
%al:findNextItemNumber(%sel2) is: 5
</p></ol>
</p>


==See also==
==See also==
<ul><li>[[FindPreviousItemNumber (Arraylist function)|FindPreviousItemNumber]] is identical to <var>FindNextItemNumber</var> except that it searches backward in the <var>Arraylist</var>.</ul>
<ul>
<li><var>[[FindPreviousItemNumber (Arraylist function)|FindPreviousItemNumber]]</var> is identical to <var>FindNextItemNumber</var> except that it searches backward in the <var>Arraylist</var>.
</ul>
 
{{Template:Arraylist:FindNextItemNumber footer}}
{{Template:Arraylist:FindNextItemNumber footer}}

Latest revision as of 15:40, 1 November 2012

Return number of matching item (Arraylist class)

FindNextItemNumber searches "forward" in the Arraylist to find and return the item number of the next item that matches a specified criterion. The criterion is supplied by the SelectionCriterion object that is a required FindNextItemNumber parameter. If no item satisfies the criterion, the method returns a zero.

Syntax

%number = al:FindNextItemNumber( selectionCriterion, [Start= number])

Syntax terms

%number A numeric variable to return the item number of the item that is located by the search.
al An Arraylist object.
selectionCriterion A selectionCriterion object, which is a relational expression that is applied to an al item value to determine whether the value satisfies the expression. The expression consists of a function, an operator, and a numeric or string value.

For example, GT(this, -11) is the criterion this > -11, where this is an identity function that simply returns the item's value. The first item tested by FindNextItemNumber that satisfies this expression is the method's return value.

The function in the criterion is a method value (a method or class member name literal, or a method variable) for a method that operates on items of the type specified on the al declaration and that returns a numeric or string value. This is described further in "Specifying a SelectionCriterion's parameters".

Start The number of the item after which to begin the search. If the number value of Start is 2, item 3 is the first item considered. The value of Start may be 0 through the number of items in the collection. For a collection of three items, number may be 0, 1, 2, or 3.

The default value for Start is 0; to start from the first item in al.

This is an optional, but name required, argument; if you specify a value, the parameter name Start is required.

Usage notes

  • If the value of start is greater than the number of items in the Arraylist, the request is cancelled. If the value of start is equal to the number of items, FindNextItemNumber returns a zero.
  • FindNextItemNumber is available in Sirius Mods Version 7.6 and later.
  • If one is only looking for the first or only item that matches that selection criteria and one doesn't care about the item number of the matching item, FindNextItem might be a better method to use than FindNextItemNumber.

Examples

The following request contains two FindNextItemNumber calls, one with a simple selection criterion and one with a compound criterion:

begin %al is arraylist of float %al = list(111, 29, 0, 93, 77, -345) %sel1 is object selectionCriterion for float %sel2 is object selectioncriterion for float %sel1 = GT(this, 100) %sel2 = AND(GE(this, 53), LT(this, 93)) printText {~} is: {%al:findNextItemNumber(%sel1, start=1)} printtext {~} is: {%al:findNextItemNumber(%sel2)} end

The result is:

%al:findNextItemNumber(%sel1, start=1) is: 0 %al:findNextItemNumber(%sel2) is: 5

See also

  • FindPreviousItemNumber is identical to FindNextItemNumber except that it searches backward in the Arraylist.