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Editing Foreach

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Added by NVSE 4. Used to repeat a script block for each entry in a collection. The collection may be either a container, [[Array Variable|array]] or [[String Variable|string]]. This can be a good alternative to using [[while]] or [[goto]] because it avoids infinite loop crash mistakes. However, be wary altering the size of the collection within the loop, as this may result in unexpected behavior.
{{Function
|origin = NVSE
|summary = Added by NVSE V4. Used to repeat a script block for each entry in an array. Each entry is itself a [[Array Variables|stringmap array]] with two fields, <b>"key"</b> and <b>"value"</b>.


Within foreach loops, the command <b>continue</b> may be used to skip any remaining loop code for that entry, and move on to the next. In the same context, the command <b>break</b> may be used to end the loop immediately, ignoring any remaining code and entries.
Within foreach loops, the command <b>continue</b> may be used to skip any remaining loop code for that entry, and move on to the next. In the same context, the command <b>break</b> may be used to end the loop immediately, ignoring any remaining code and entries.


==Syntax and Usage==
|name = Foreach
In the case of a container, an entry is a temporary reference to an item in its inventory. This means it may be used as a [[calling reference]], but becomes invalid once the loop ends. (See also: [[GetInvRefsForItem]], [[CopyIR]], [[RemoveMeIR]], [[IsEquipped]]).
|returnType = void
<pre>
|arguments =  
ref Item
  {{FunctionArgument
ref Container
  |Name = entry
foreach Item:tempref <- Container:ref
  |Type = array{{FunctionArgument
    ; Item is a temporary reference to an item in the container
  |Name = <-
loop
  |Type =
</pre>
  }}
 
  }}{{FunctionArgument
For an [[Array Variable|array]], each entry is a stringmap with two fields, <b>"key"</b> and <b>"value"</b>. The key is the index of the entry in the collection (0, 1, 2... for regular list arrays). (Note: you can replace 'entry["value"]' with the shorthand '*entry', see [[NVSE Expressions]])
  |Name = set
  |Type = array
  }}
}}
<pre>
<pre>
array_var SomeArray
array_var Entry
array_var Entry
array_var Collection


foreach Entry:array <- Collection:array
foreach Entry <- SomeArray
     ; Entry["key"] is the key (index) of each entry (0, 1, 2... for lists)
     ; Entry["key"] is the key (index) of each entry (0, 1, 2... for lists)
     ; Entry["value"] is the value of each entry in the array
     ; Entry["value"] is the value of each entry in the array
loop
</pre>
For a string, each entry is a string containing a single character.
<pre>
string_var Char
string_var Source
foreach Char:string <- Source:string
    ; Char is a single character in String
loop
loop
</pre>
</pre>


==Example==
==Example==
<pre>
ref rItem
ref rActor
foreach rItem <- rActor
  if rItem.IsEquipped
        rItem.UnequipMe
  endif
loop
; Will unequip all equipped items from rActor
</pre>
<pre>
<pre>
array_var Beatles
array_var Beatles
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</pre>
</pre>


You can also use the [[Ar_Range]] command to approximate the traditional 'C' style for loop. The code below prints the numbers 0-10:
You can also use the [[Ar_Range]] command to approximate the traditional 'C' style for loop. The code below [[Print|prints]] the numbers 0-10:
<pre>
<pre>
foreach Entry <- (Ar_Range 0, 10)
foreach entry <- (Ar_Range 0, 10)
     Print $Entry["value"]
     Print $entry["value"]
loop
loop
</pre>
</pre>
Note that above we reference <b>Entry["value"]</b> in the [[Print]] function directly, rather than use an intermediary variable (<b>let SomeVar := Entry["value"]..</b>). This is only possible when using NVSE aware functions or the [[Script Compiler Override]].


==See Also==
==See Also==
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*[[Eval]]
*[[Eval]]
*[[Label]]/[[Goto]]
*[[Label]]/[[Goto]]
*[[GetListForms]] (converts a form list to an array, so you can use foreach with it)
*[[NVSE Expressions]]
==External Links==
==External Links==
*[http://obse.silverlock.org/obse_command_doc.html#OBSE_Expressions List of supported expression found in OBSE, these are equivalent in NVSE]
*[http://obse.silverlock.org/obse_command_doc.html#OBSE_Expressions List of supported expression found in OBSE, these are equivalent in NVSE]
*[http://fallout.bethsoft.com/eng/links/privacyredirect.php?site=http://www.loverslab.com/topic/26749-tutorial-nvse4-part-1-syntax-and-expressions/ Tutorial on syntax and expressions in NVSE 4] (this link requires pre-setting user details for this site)
*[http://fallout.bethsoft.com/eng/links/privacyredirect.php?site=http://www.loverslab.com/topic/26749-tutorial-nvse4-part-1-syntax-and-expressions/ Tutorial on syntax and expressions in NVSE 4]
[[Category:Functions_(NVSE)]]
[[Category:Functions_(NVSE)]]
[[Category:Commands]]
[[Category:Commands]]
[[Category:Scripting]]
[[Category:Scripting]]

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