Change values in arrays while rolling through them.

See https://www.scotsscripts.com/mvblog/sort-tricks-for-quicksortarray.html for a more basic example in SMT.

This is an example of rolling through options in basket groups and changing prices without going through the "make a new array while we go along" deal.

We create a reference array called l.groups based on l.all_settings:basket:groups - any changes we make to l.groups will be reflected in the original array. Works in mivascript and SMT.

<MvASSIGN NAME = "l.ok" VALUE = "{ miva_array_copy_ref( l.all_settings:basket:groups, 1, miva_array_elements(l.all_settings:basket:groups), l.groups, 1 ) }" />

<MvFOREACH ITERATOR = "l.group" INDEX = "l.grouppos" ARRAY = "l.groups">
	<MvFOREACH ITERATOR = "l.option" INDEX = "l.optionpos" ARRAY = "l.group:options">
		<MvIF EXPR = "{ gettoken(l.option:subtotal,'.',2) GE 50 }">
			<MvASSIGN NAME = "l.option:subtotal" VALUE = "{ l.option:subtotal + 1 }" />
			<MvASSIGN NAME = "l.option:subtotal" VALUE = "{ gettoken(l.option:subtotal,'.',1) $ '.00' }" />
			<MvASSIGN NAME = "l.option:formatted_subtotal"	VALUE = "{ [ g.Module_Root $ g.Store:currncy_mod:module ].CurrencyModule_AddFormatting( g.Store:currncy_mod, l.option:subtotal ) }">
		<MvELSE>
			<MvASSIGN NAME = "l.option:subtotal" VALUE = "{ gettoken(l.option:subtotal,'.',1) $ '.00' }" />
			<MvASSIGN NAME = "l.option:formatted_subtotal"	VALUE = "{ [ g.Module_Root $ g.Store:currncy_mod:module ].CurrencyModule_AddFormatting( g.Store:currncy_mod, l.option:subtotal ) }">
		</MvIF> 
	</MvFOREACH>	
		
	<MvASSIGN NAME = "l.total" VALUE = "{ l.group:subtotal_comprehensive + l.total }" />
</MvFOREACH>

After we're done, the original l.all_settings:basket:groups array will contain the various price changes we made.

Scot's Modules

All modern modules from Scot have a sort(l.list) function that sorts on disp_order - and it's easy to add disp_order to the array structure using miva_array_copy_ref(...)

For example, load all product custom fields into l.fields and alphabetize them. First use miva_array_copy_ref(...) then roll through the reference array and set disp_order to the field name and then use the sort function to alphabetize the "parent" array.

<MvASSIGN NAME = "l.ok" VALUE = "{ [ g.Module_Root $ '/modules/util/customfld.mvc' ].ProductFieldList_Load_All( l.fields ) }" />

<MvASSIGN NAME = "l.ok" VALUE = "{ miva_array_copy_ref( l.fields, 1, miva_array_elements(l.fields), l.temp, 1 ) }" />
	
<MvFOREACH ITERATOR = "l.item" INDEX = "l.itempos" ARRAY = "l.temp">
	<MvASSIGN NAME = "l.item:disp_order" VALUE = "{ l.item:name }" />
</MvFOREACH>

<MvASSIGN NAME = "l.ok" VALUE = "{ sort(l.fields) }" />

Done. The custom fields which load by default in ID order are now sorted in alpha order by name.