Ruby 2.5 enumerable predicates accept pattern argument | BigBinary Blog
Ruby 2.5.0 was recentlyreleased. Ruby has sequence predicates such as all?, none?, one? and any? whichtake a block and evaluate that by passing every element of the sequence to it. if queries.any? { |sql| /LEFT OUTER JOIN/i =~ sql }logger.log "Left outer join detected"endRuby 2.5 allows using a shorthand for this bypassing a pattern argument.Internally case equality operator(===) is used against e
Ruby 2.4 adds Enumerable#uniq & Enumerable::Lazy#uniq
In Ruby, we commonly use uniq method on an array to fetch the collection ofall unique elements. But there may be cases where we might need elements in ahash by virtue of uniqueness of its values. Let's consider an example of countries that have hosted the Olympics. We onlywant to know when was the first time a country hosted it. # given object{ 1896 => 'Athens', 1900 => 'Paris', 1904 => 'Chicago',
Ruby 2.4 implements Enumerable#sum
It is a common use case to calculate sum of the elements of an array or valuesfrom a hash. [1, 2, 3, 4] => 10{a: 1, b: 6, c: -3} => 4Active Support already implementsEnumerable#sum > [1, 2, 3, 4].sum #=> 10> {a: 1, b: 6, c: -3}.sum{ |k, v| v**2 } #=> 46> ['foo', 'bar'].sum # concatenation of strings #=> "foobar"> [[1], ['abc'], [6, 'qwe']].sum # concatenation of arrays #=> [1, "abc", 6, "qwe"]Unti
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