Is there a standard method in Ruby to prepend and/or append a string onto each of an array of strings?

Question

listOfnames = [ 'john', 'dave', 'joe' ];    
mrNames = prependToAll('Mr. ', list of names);

resulting in [ 'Mr. john', 'Mr. dave', 'Mr. joe' ]

Is there a version to do so in place?

Or is there a standard way for some easy each to replace array entries in the array being iterated over?

Clear and succinct statement of question, but camel-case variable and method names grate (not Ruby convention). — Cary Swoveland, Nov 17 '13 at 18:13

score 8 · Accepted Answer · answered Nov 17 '13 at 17:52

8

listOfnames.map {|name| "Mr. " + name}

If you need to edit the listOfnames variable, use the destructive version of map:

listOfnames.map! {|name| "Mr. " + name}

answered Nov 17 '13 at 17:52

Zippie

yep - of course I should have found that :) But it's a big world out there :) thanks! – peterk Nov 18 '13 at 20:45

score 2 · Answer 2 · answered Nov 17 '13 at 17:59

2

There is prepend, but not for an array.

%w[john dave joe].map{|s| s.prepend("Mr. ")}
# => ["Mr. john", "Mr. dave", "Mr. joe"]

answered Nov 17 '13 at 17:59

sawa

score 1 · Answer 3 · answered Nov 17 '13 at 18:29

1

Same result using Array#product

["Mr. "].product(listOfNames).map(&:join)

answered Nov 17 '13 at 18:29

dotpao

3 Answers3