Class: Object

Inherits:

BasicObject

Extended by:

MacOSVersionErrorCompat

Defined in:

extend/blank.rb,
macos_version.rb

Overview

LazyObject does not work for exceptions when used in rescue statements.

Instance Method Summary

• #blank? ⇒ Boolean

  An object is blank if it’s false, empty, or a whitespace string.

• #presence ⇒ T.self_type^?

  Returns the receiver if it’s present otherwise returns +nil+.

• #present? ⇒ Boolean

  An object is present if it’s not blank.

Methods included from MacOSVersionErrorCompat

const_missing

Instance Method Details

#blank? ⇒ Boolean

An object is blank if it’s false, empty, or a whitespace string. For example, +nil+, ‘’, ‘ ‘, [], {}, and +false+ are all blank.

This simplifies

!address

address.empty?

to

address.blank?

Returns:

• (Boolean)

# File 'extend/blank.rb', line 16

def blank?
  respond_to?(:empty?) ? !!T.unsafe(self).empty? : false
end

#presence ⇒ T.self_type^?

Returns the receiver if it’s present otherwise returns +nil+. object.presence is equivalent to

object.present? ? object : nil

For example, something like

state = params[:state] if params[:state].present? country = params[:country] if params[:country].present? region = state || country || ‘US’

becomes

region = params[:state].presence

params[:country].presence

‘US’

Returns:

• (T.self_type, nil)

# File 'extend/blank.rb', line 41

def presence
  self if present?
end

#present? ⇒ Boolean

An object is present if it’s not blank.

Returns:

• (Boolean)

# File 'extend/blank.rb', line 22

def present?
  !blank?
end