Ruby / avoid errors when nil in sort_by

Question

input.sort_by { |h| sorter.index(h[:id]) }

In some unfortunate cases; sorter.index(h[:id]) returns nil, it then returns an error

How would one cleanly avoid such error to happen, while having the rest of the array sorted ?

Add || -1 if you want them at the start or || sorter.size if you want them at the end. — ndnenkov
– ndnenkov, Commented Mar 7, 2018 at 11:23
what does || -Float::INFINITY would do compared to the two others ? adds it at the beginning ? — Ben
– Ben, Commented Mar 7, 2018 at 11:25
-Float::INFINITY will do the same as -1. You can put it as an alternative to the index. Aka sorter.index(h[:id]) || -Float::INFINITY. — ndnenkov
– ndnenkov, Commented Mar 7, 2018 at 11:25

Mark · Accepted Answer · 2018-03-07 12:00:08Z

1

input.sort_by { |h| [sorter.index(h[:id]) ? 1 : 0, sorter.index(h[:id])] }

This will take all values, sort them by whether they have a sorter.index(h[:id]) available initially, and then sort those with that value by that value

answered Mar 7, 2018 at 12:00

Mark

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