How do i concatinate some element of array and recreate array in ruby

Question

I have a string. I need to split it and assign values to hash. But before assigning it, I need to modify the original array and concatenate some of its elements then recreate the array again. Please help me on how to do it in ruby.

Consider

  array = ["unix", "2", "[", "ACC", "]", "STREAM", "LISTENING", "12459", "tmp/control"].

I need to concatenate "[", "ACC", "]".

Now the new Array should look like

  array = ["unix", "2", "[ ACC ]", "STREAM", "LISTENING", "12459", "tmp/control"].

Please suggest.

Show the original string, perhaps there is a better way to split it. — hirolau
– hirolau, Commented Nov 8, 2013 at 12:47

Arup Rakshit · Accepted Answer · 2013-11-08 12:41:25Z

1

array = ["unix", "2", "[", "ACC", "]", "STREAM", "LISTENING", "12459", "tmp/control"]
m,n = array.index('['),array.index(']')
array[m..n]=array[m..n].join(" ")
p array 
# => ["unix", "2", "[ ACC ]", "STREAM", "LISTENING", "12459", "tmp/control"]

answered Nov 8, 2013 at 12:41

Arup Rakshit

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4 Comments

Amol Pujari Over a year ago

Missing one , in case of ` array = ["unix", "2", "[", "ACC", "ACC2", "]", "STREAM", "LISTENING", "12459", "tmp/control"]` :)

Arup Rakshit Over a year ago

@AmolPujari OP didn't mention that...In such a case this answer needs to be changed... :)

Amol Pujari Over a year ago

its would be interested to know and review code generating the input array here.

Boris Stitnicky Over a year ago

It is interesting to see an accepted answer with 4 comments and not a singl upvote. +1

hirolau · Accepted Answer · 2013-11-08 15:13:30Z

1

Posting this answer as 1: The accepted solution only works with one set of square brackets and 2: How often do you actually get to solve something using flip flop?

array = ["unix", "2", "[", "ACC", "]", "STREAM", "[", "some",  "other", "]", "x"]

array = array.chunk{|x| (x=='['..x==']') ? true : false }
            .map{|join, array| join ? array.join(' ') : array}
            .flatten

p array #=> ["unix", "2", "[ ACC ]", "STREAM", "[ some other ]", "x"]

edited Nov 8, 2013 at 15:13

answered Nov 8, 2013 at 14:23

hirolau

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