Module: Philiprehberger::Result::Filterable

Included in:

Err, Ok

Defined in:

lib/philiprehberger/result/filterable.rb

Overview

Filtering support for Ok and Err results.

Instance Method Summary

• #filter(error_fn) {|value| ... } ⇒ Ok, Err

  If Ok and predicate fails, convert to Err with the given error.

Instance Method Details

#filter(error_fn) {|value| ... } ⇒ Ok, Err

If Ok and predicate fails, convert to Err with the given error. If already Err, pass through unchanged.

Parameters:

• error_fn (#call) —

  callable returning the error value

Yields:

• (value) —

  predicate block receiving the success value

Returns:

• (Ok, Err)

# File 'lib/philiprehberger/result/filterable.rb', line 13

def filter(error_fn, &block)
  return self if err?
  return self if block.call(@value)

  Err.new(error_fn.call)
end