How to build an array given a dynamic list of variables?

Question

Given a very long list of colors, for now let's say 3:

["red", "green", "blue"]

How can I iterate over a string and do the following, match XXXX and return a string for each color type

sentences = Array.new
master_sentence = "This is a XXXX ball"

sa.push("This is a XXXX ball")

Where sentences now contains:

"This is a red ball"
"This is a green ball"
"This is a blue ball"

What is a "dynamic list of variables"? And where is that dynamic list of variables in your code? Also, what does this have to do with ruby-on-rails or the weirdly specific ruby-on-rails4? — Jörg W Mittag
– Jörg W Mittag, Commented Jan 12, 2017 at 16:53
just go through docs you don't need to ask all these simple questions on stack overflow — Deepak Mahakale
– Deepak Mahakale, Commented Jan 12, 2017 at 16:59

Ilya · Accepted Answer · 2017-01-12 16:48:47Z

2

You can iterate by using map:

array = ["red", "green", "blue"]
master_sentence = "This is a XXXX ball"

array.map {|color| master_sentence.gsub(/XXXX/, color)}
=> ["This is a red ball", 
    "This is a green ball", 
    "This is a blue ball"]

answered Jan 12, 2017 at 16:48

Ilya

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Coolness · Accepted Answer · 2017-01-12 16:49:37Z

1

Something like this?

 a = ["red", "green", "blue"]
=> ["red", "green", "blue"]
 a.map{|x| "This is a #{x} ball"}
=> ["This is a red ball", "This is a green ball", "This is a blue ball"]

answered Jan 12, 2017 at 16:49

Coolness

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2 Comments

AnApprentice Over a year ago

I appreciate this, the problem with this answer is the sentence needs to be handled dynamically as seen in the other answer.

Coolness Over a year ago

I see, i misunderstood.

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