Delete a string in an array when it exist in another array

Question

In a ruby-script I have two arrays

exclude = ['bgb400', 'pip900', 'rtr222']
result = ['pda600', 'xda700', 'wdw300', 'bgb400', 'ztz800', 'lkl100']

I want to iterate over the result array and remove any string that exists in the exclude array. In the end the string 'bgb400' should be removed from the result array.

Please show what have you tried so far.

Roman Kiselenko
– Roman Kiselenko

2014-11-17 10:12:11 +00:00
Commented Nov 17, 2014 at 10:12 — Roman Kiselenko
– Roman Kiselenko, Commented Nov 17, 2014 at 10:12

Yossi · Accepted Answer · 2014-11-17 11:45:26Z

4

Use operator -

irb(main):004:0> result - exclude
=> ["pda600", "xda700", "wdw300", "ztz800", "lkl100"]

If you really need to modify your result array you can use reject!. However if it is the case, you better review your code.

result.reject! {|s| exclude.include? s}

edited Nov 17, 2014 at 11:45

answered Nov 17, 2014 at 10:12

Yossi

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3 Comments

Bent Blue Over a year ago

Thanks a lot, I already tried this. But unfortunately I forgot to do a "chomp" at the array. Because I filled the array from a file. First I thought "result - exclude" don't work for me, but you made me check my code again. I know it is a terrible newbie mistake, but I wasn't able to find this mistake for hours!

Yossi Over a year ago

Added code to iterate and remove items. I hope you have a reason to make it this way.

Bent Blue Over a year ago

The added code works also fine. I will use your first proposal. But I learned a lot Ruby Stuff today. Thank you, Yossi

Abdul Baig · Accepted Answer · 2014-11-17 10:12:58Z

3

simply do:

new_result = result - exclude
=> ["pda600", "xda700", "wdw300", "ztz800", "lkl100"]

actually what it does is check for matching entries in both arrays and produce the result excluding the matching entries.

answered Nov 17, 2014 at 10:12

Abdul Baig

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Comments

Darkmouse · Accepted Answer · 2014-11-17 16:31:10Z

1

It sounds like Array#delete_if method is best for this task.

exclude = ['bgb400', 'pip900', 'rtr222']
result = ['pda600', 'xda700', 'wdw300', 'bgb400', 'ztz800', 'lkl100']

In order to remove elements in the reuslt array that are included in the excude array try this

result.delete_if{|r|exclude.include?('r')}

answered Nov 17, 2014 at 16:31

Darkmouse

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