How to modify strings in an array using iteration

Question

I'm trying to iterate through an array @idea_benefit which looks like this:

["happier_customers", "happier_employees", "increased_revenue", "happier_customers", "decreased_costs", "happier_customers", "increased_revenue", ]

I need its elements to be humanized and capitalized like:

["Happier Customers", "Increased Revenue", ...]

I tried this:

@idea_benefit = []
@evaluations.each do |eval|
  @idea_benefit << eval.benefit
  @idea_benefit.flatten
end
@idea_benefit.each do |benefit|
  benefit.gsub("_", " ").capitalize
end

but I could not target the individual strings. How do I make this work?

but I've been unsuccessful targeting the individual strings could you please elaborate that part with an example? — Emu
– Emu, Commented Jun 18, 2015 at 4:19

Arup Rakshit · Accepted Answer · 2015-06-18 04:29:20Z

7

In Rails, you can do it using humanize and titleize.

a =  ["happier_customers", "happier_employees", "increased_revenue", "happier_customers", "decreased_costs", "happier_customers", "increased_revenue" ]
a.map { |string| string.humanize.titleize }
# => ["Happier Customers", "Happier Employees", "Increased Revenue", "Happier Customers", "Decreased Costs", "Happier Customers", "Increased Revenue"]

answered Jun 18, 2015 at 4:29

Arup Rakshit

119k30 gold badges270 silver badges328 bronze badges

Sign up to request clarification or add additional context in comments.

Comments

sawa · Accepted Answer · 2015-06-18 04:23:54Z

3

@idea_benefit =
@evaluations.flat_map(&:benefit).map{|e| e.gsub("_", " ").capitalize}

answered Jun 18, 2015 at 4:23

sawa

169k51 gold badges287 silver badges398 bronze badges

1 Comment

Virge Assault Over a year ago

Beautiful. This does only capitalize the first word though (i.e. "Increased revenue" instead of "Increased Revenue"). Is there a way to capitalize both?

Wally Altman · Accepted Answer · 2015-06-18 04:27:38Z

0

You're looking for the Enumerable method map.

@idea_benefit = []
@evaluations.each do |eval|
  @idea_benefit << eval.benefit
  @idea_benefit.flatten
end

desired_output = @idea_benefit.map do |benefit|
  benefit.gsub("_", " ").capitalize
end

The map method operates on each element of an Enumerable object (an Array, in your case) and returns a new Enumerable. The block could be multiple lines if you needed; the return value of the block (usually the result of the last line) is what goes in the new array.

edited Jun 18, 2015 at 4:27

answered Jun 18, 2015 at 4:21

Wally Altman

3,5453 gold badges27 silver badges33 bronze badges

2 Comments

Virge Assault Over a year ago

this gives me the error undefined method gsub' for ["happier_customers", "happier_employees", "increased_revenue"]:Array`

Wally Altman Over a year ago

I'm assuming you've already flattened the array. I edited in the rest of your code to make it a little clearer.

Collectives™ on Stack Overflow

How to modify strings in an array using iteration

3 Answers 3

Comments

1 Comment

2 Comments

Hot Network Questions

Collectives™ on Stack Overflow

3 Answers 3

Comments

1 Comment

2 Comments

Related