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I have two arrays one = [1,2,3,4,5,6,7] and two = [{1=>
‘10‘},{3=>
‘22‘},{7=>
‘40‘}]
Two will have one.length hashes or less. I want a new array of values from two if it‘s key appears in one, if not then use 0. The new array would be
[10,0,22,0,0,0,40] What is the best way to do this?
【Merge array and hash in ruby if key appears in array】
I‘d do it using
Enumerable#reduce and
Hash#values_at:
two.reduce({}, :merge).values_at(*one).map(&
:to_i)
# =>
[10, 0, 22, 0, 0, 0, 40]
h = [{1 =>
‘10‘}, {3 =>
‘22‘}, {7 =>
‘40‘}].inject(:merge)
one.map{|e| h[e].to_i}
# =>
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