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 collapse

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)


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

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

#presenceT.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)


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# 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)


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

def present?
  !blank?
end