Delete an array from a multi-dimensional array in ruby

Question

I have a multi-dimensional array of this form:

array = [["http://domain.com/product.html", 10], ["http://domain.com/product.html", 150], ["http://domain.com/product.html", 500]]

I need to delete all arrays that have the last value smaller than 150.

I already tried the following, but it doesn't seem to have any effect:

array.delete_if {|element| element.last < 150 }

Any help will be highly appreciated. Thanks.

It somehow gives me the same array, it doesn't delete any element from it. — user3493101
– user3493101, Commented Apr 3, 2014 at 9:55
The code you've posted works as expected: codepad.org/CvR9Ykfr — Stefan
– Stefan, Commented Apr 3, 2014 at 10:00

Kumar Akarsh · Accepted Answer · 2014-04-03 09:46:02Z

1

I would probably do it this way:

array.reject!{|x| x if x.last < 150}

answered Apr 3, 2014 at 9:46

Kumar Akarsh

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5 Comments

Arup Rakshit Over a year ago

This is not an answer to this post,, It is another way to solve this.. Do you know why #delete_if didn't work in OP's example, which I am quite sure should work

user3493101 Over a year ago

I have no idea why it doesn't work, it just gives me the same multi-dimensional array, unchanged.

sawa Over a year ago

Perhaps the OP didn't refer to the return value, but referred to array again. That is the point of this answer.

Arup Rakshit Over a year ago

I don't know why this answers has been entertained, which has not been asked.. OP didn't ask how to do it, while OP asked why not working

Arup Rakshit Over a year ago

@user3493101 Although this answer misleading, correct way to write is array.reject!{|x| x.last < 150}. If you like it, teach yourself, this way.

sidney · Accepted Answer · 2014-04-03 09:51:11Z

0

You can also use this:

array.map{|f| f if f.last < 150}.compact

I don't know if it is better or not than Akarsh, just another solution that I would have used. Anyways, your solution works, user3493101, but if it doesn't, you can still use that.

answered Apr 3, 2014 at 9:51

sidney

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