Module: Jinx::Collector

Defined in:
lib/jinx/helpers/collector.rb

Overview

The Collector utility implements the Collector.on method to apply a block to a collection transitive closure.

Class Method Summary collapse

Class Method Details

.on(obj, &block) ⇒ Object

Collects the result of applying the given block to the given obj. If obj is a collection, then collects the result of recursively calling this Collector on the enumerated members. If obj is nil, then returns nil. Otherwise, calls block on obj and returns the result.

Examples:

Collector.on([1, 2, [3, 4]]) { |n| n * 2 } #=> [2, 4, [6, 8]]]
Collector.on(nil) { |n| n * 2 } #=> nil
Collector.on(1) { |n| n * 2 } #=> 2

Parameters:

  • obj —

    the collection or item to enumerate



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# File 'lib/jinx/helpers/collector.rb', line 16

def self.on(obj, &block)
  obj.collection? ? obj.map { |item| on(item, &block) } : yield(obj) unless obj.nil?
end