check if a variable is in array in ruby

Question

I have all my IPs in an array as below.

list_of_ips = Socket.ip_address_list.select{|intf| intf.ipv4?}

I am trying to use Enumerable include to check whether this array contains IP 192.168.1.27 which it does, but I get the return value as false.

puts list_of_ips[1].ip_address  ## This prints 192.168.1.27
puts $this_is_my_ip             ## This prints 192.168.1.27

puts list_of_ips.include? '192.168.1.27'  ## Gives me false

I think I need to use to filter the array with ip_address somehow, but not sure how.

Santhosh · Accepted Answer · 2014-12-23 16:56:17Z

6

list_of_ips.any? {|ip| ip.ip_address == '192.168.1.27'}

answered Dec 23, 2014 at 16:56

Santhosh

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1 Comment

Arup Rakshit Over a year ago

Clever... Anything left ? :)

Linuxios · Accepted Answer · 2014-12-23 16:55:03Z

2

You need to transform the objects in the array temporarily to strings to compare them to strings. Try this:

list_of_ips.map {|addr| addr.ip_address}.include? '192.168.1.27'

answered Dec 23, 2014 at 16:55

Linuxios

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3 Comments

Arup Rakshit Over a year ago

Yes.. it is... Voted up.

Max Over a year ago

list_of_ips.map(&:ip_address)

Linuxios Over a year ago

@max: I always forget that shortcut, even though I've worked with ruby for years. Thanks!

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