I have an array:
scores = [1, 2, 3, "", 4]
And I want to remove all blank values. But when I run this:
puts scores.reject(&:empty?)
I get an error:
undefined method `empty' for 1:Fixnum
How can I remove values that are not integers from my array in a one step process? I am using Ruby 1.9.3.
To reject only nil would be:
array.compact
If you want to remove blank values, you should use blank?: (requires Rails / ActiveSupport)
scores.reject(&:blank?)
#=> [1, 2, 3, 4]
"", " ", false, nil, [], and {} are blank.
It is as simple as:
scores.grep(Integer)
Note that if you plan to map the values, you can do that in a block after:
scores.grep(Integer){|x| x+1 }
Bonus if you want to do the same thing, but your numbers are strings:
scores.grep(/\d+/){|x|x.to_i}
Integer, not FixnumTry this :
scores.select{|e| e.is_a? Integer}
# => [1, 2, 3, 4]
If you really need reject nil only, so it can be done like this:
scores.reject(&:nil?)
scores = [1, 2, 3, "", 4, nil]
scores.reject{|s| s.to_s == ''}
# => [1, 2, 3, 4]
This Worked for me
scores.reject!{|x| x.to_s.empty?}
scores.select{|score| score.is_a? Fixnum}
or, as Fixnum inherits from Integer, you can also go for
scores.select{|score| score.is_a? Integer)
...if that seems more descriptive.
Array and Enumerable tend to offer many ways of doing the same thing.
&:empty? will work for hashes, arrays, and strings, but not numbers. The method you use in reject must be valid for all items in a list. &:blank? will work fine for this reason.
