Ruby array sort by multiple attributes

Question

test = [["movie5name","2014"],["movie2name","2016"],["movie3name","2016"],["movie3name","2017"]]
testNew = test.sort_by{|n| [-n[1],n[0]]}

I was trying to sort above array by first sorting based on descending order of year then based on the acesding order of the movie name. However, it shows undefined method error because the negative sign before n:(

Baldrick · Accepted Answer · 2015-02-28 14:51:57Z

4

That's because you're trying to make a string negative, try following code:

testNew = test.sort_by{|n| [-n[1].to_i,n[0]]}

Assuming that n[1] is always convertible to a number.

edited Feb 28, 2015 at 14:51

Baldrick

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answered Feb 28, 2015 at 14:08

Ashish Gaur

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