Psmb.MapReduce

This package provides .map() and .reduce() FlowQuery operations. Could be useful, huh?

Installation

composer require 'psmb/mapreduce:@dev'

Usage

Map

Takes all items in current FlowQuery context, and transforms each value with given Eel operation. There is a context variable value available, with a value of a current node.

E.g. this would give you an array of identifiers of all child nodes of a given node:

${q(node).children().map('value.identifier')}

See: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/map

Reduce

Takes an Eel Expression as a first argument and initial values as the second. Injects previousValue, currentValue, index and array context variables.

E.g. imagine you have a collection of Order nodes, where each node has a price property. Now let's try to get a total price for all of the give nodes:

${q(node).children('orders').reduce('previousValue + currentValue.properties.price', 0)

See: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/Reduce