created: 20201004154413968
modified: 20201006181831622
tags: [[Operator Examples]] [[reduce Operator]]
title: reduce Operator (Examples)
type: text/vnd.tiddlywiki

\define add-price() [get[price]multiply{!!quantity}add<accumulator>]
\define num-items() [get[quantity]add<accumulator>]
\define display-variable(name)
''<$text text=<<__name__>>/>'': <code><$text text={{{ [<__name__>getvariable[]] }}}/></code>
\end

These examples use the following predefined variables:

* <<display-variable add-price>>
* <<display-variable num-items>>

They also use the following data tiddlers:

<ul>
<$list filter="[tag[shopping]!has[draft.of]]">
<li>
''<$link><$text text=<<currentTiddler>>/></$link>'' quantity: <$text text={{!!quantity}}/>,  price: <$text text={{!!price}}/>
</li>
</$list>
</ul>

Number of items: 

<<.operator-example 1 "[tag[shopping]reduce<num-items>]">>

Total price:

<<.operator-example 2 "[tag[shopping]reduce<add-price>]">>