I have array of arrays, which looks like this:
a = [['1','1500','SomeName','SomeSurname'],
['2','1500','SomeName2','SomeSurname2'],
['3','1500','SomeName3','SomeSurname3'],
['4','1501','SomeName','SomeSurname'],
...]
I can get sub-array of this array with all rows containing '1500' value by .each
function and simple if
, but if a.length
is large, it's taking too much time! How can I get all rows from a
with certain a[1]
value, without iterating over a
?
Enumerable#find_all
is what you are looking for:
a.find_all { |el| el[1] == '1500' } # a.select will do the same
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