module EnumerableWithScanLeft

Optional refinement which refines Enumerable to add a #scan_left method, in order to provide a more natural syntax in comparison to explicitly creating instances of the ScanLeft class.

Without using this refinement, we wrap Enumerables in ScanLeft instances:

ScanLeft.new([1,2,3]).scan_left(0, &:+)  # => [0, 1, 3, 6]

Using this refinement, we can call #scan_left directly on any Enumerable:

[1,2,3].scan_left(0, &:+)                # => [0, 1, 3, 6]

@example

class Foo
  using EnumerableWithScanLeft

  def bar(x)
    [1,2,3].scan_left(x, &:+)
  end
end

Foo.new.bar(10)  # => [10, 11, 13, 16]

Public Instance Methods

scan_left(initial, &block) click to toggle source

# File lib/scan_left/enumerable_with_scan_left.rb, line 30
def scan_left(initial, &block)
  ScanLeft.new(self).scan_left(initial, &block)
end