Coalescer

Enables coalesce chaining values on Ruby

Installation

Add this line to your application's Gemfile:

gem 'coalescer'

And then execute:

$ bundle install

Or install it yourself as:

$ gem install coalescer

Usage

require 'coalescer'

# Tired of this?
foo || bar || baz || 'default' # => 'default'

# Now you can do this
foo.coalesce(bar, baz, 'default') # => 'default'

# Or this
[foo, bar, baz, 'default'].coalesce! # => 'default'

# This is specially useful when you have a lengthy list of possible conditions based on coalescence
def which_price(item)
  price = item.price ||
            item.order.price ||
            item.product.customer_price ||
            item.product.price

  price.to_d.round(2)
end

# Can be refactored to
def which_price(item)
  [item.price,
   item.order.price,
   item.product.customer_price,
   item.product.price].coal!.to_d.round(2)
end

# Noticed something? There are shorthand methods for coalesce and coalesce!
foo.coal(bar, baz, 'default') # => 'default'
[foo, bar, baz, 'default'].coal! # => 'default'

# if you need lazy evaluation, you can pass a proc to coalesce
foo.coalesce(-> { :bar }) # => :bar

# or coalesce!
[foo, bar, baz, -> { :default }].coalesce! # => :default

Contributing

Bug reports and pull requests are welcome on GitHub at https://github.com/wgirhad/coalescer

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