ruby |=

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sandbar answered on August 25, 2020 Popularity 10/10 Helpfulness 2/10

answer ruby |=

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ruby |=

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# When working with arrays |= is useful for uniquely appending to an array.
>> x = [1,2,3]
>> y = [3,4,5]

>> x |= y
>> x
=> [1, 2, 3, 4, 5]

Popularity 10/10 Helpfulness 2/10 Language ruby

Source: stackoverflow.com

Tags: ruby

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Contributed on Dec 15 2020

sandbar

0 Answers Avg Quality 2/10

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ruby ||=

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# a ||= b is a conditional assignment operator. It means:
# if a is undefined or falsey, then evaluate b and set a to the result.
# otherwise (if a is defined and evaluates to truthy), then b is not evaluated, and no assignment takes place.

a ||= nil      # => nil
a ||= 0        # => 0
a ||= 2        # => 0

# It can be useful in some memoization scenarios
def current_user
  @current_user ||= User.find_by_id(session[:user_id])
end

# it can be problematic with boolean values

foo = false 	# => false
foo ||= true 	# => true      <-- false have been a valid value 
foo ||= false 	# => true

# Send an email to the user (unintended bugs when used with boolean values)
#
# @param [String] use_ses - use AWS SES to send the email.
#                           when testing locally, set this value to false
def send_email(use_ses = nil)
  use_ses ||= true

  puts 'email sent successfully' if use_ses
end

send_email
# => email sent successfully

send_email(true)
# => email sent successfully

send_email(false)
# This is a bug
# => email sent successfully

Popularity 9/10 Helpfulness 4/10 Language ruby

Source: stackoverflow.com

Tags: assignment-operator assi

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Contributed on Oct 26 2022

klueless-io

0 Answers Avg Quality 2/10

ruby &:

Comment

ar.map { |element| element.reverse }

Popularity 10/10 Helpfulness 1/10 Language ruby

Source: stackoverflow.com

Tags: ruby

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Contributed on Aug 25 2020

Smiling Stag

0 Answers Avg Quality 2/10

||= ruby

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a ||= nil
a ||= 0
a ||= 2
# a returns 0
# ||= conditional assignment if a is unassigned then it gets assigned
# otherwise it remains with the value it has as per 2 and 3 lines

Popularity 9/10 Helpfulness 1/10 Language ruby

Source: stackoverflow.com

Tags: ruby

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Contributed on May 17 2022

Chanlee

0 Answers Avg Quality 2/10

ruby &:

Comment

ar.map(&:reverse)

Popularity 10/10 Helpfulness 1/10 Language ruby

Source: stackoverflow.com

Tags: ruby

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Contributed on Aug 25 2020

Smiling Stag

0 Answers Avg Quality 2/10

ruby |=

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