instance method `diff`

Ruby on Rails 4.0.13

Since v3.0.20 Last seen in v4.0.13

Available in: v3.0.20 v3.1.12 v3.2.22.5 v4.0.13

Compare with:

diff(other)

Returns a hash that represents the difference between two hashes.

{1 => 2}.diff(1 => 2)         # => {}
{1 => 2}.diff(1 => 3)         # => {1 => 2}
{}.diff(1 => 2)               # => {1 => 2}
{1 => 2, 3 => 4}.diff(1 => 2) # => {3 => 4}

Parameters

other req

Source

# File activesupport/lib/active_support/core_ext/hash/diff.rb, line 8
  def diff(other)
    ActiveSupport::Deprecation.warn "Hash#diff is no longer used inside of Rails, and is being deprecated with no replacement. If you're using it to compare hashes for the purpose of testing, please use MiniTest's assert_equal instead."
    dup.
      delete_if { |k, v| other[k] == v }.
      merge!(other.dup.delete_if { |k, v| has_key?(k) })
  end

Defined in activesupport/lib/active_support/core_ext/hash/diff.rb line 8 · View on GitHub · Improve this page · Find usages on GitHub

Defined in Hash

Signature

Parameters