Best way to split an array of strings in ruby?

Question

If I have an array of strings in ruby and I want to get the resulting array, what is the best way of doing it?

array = ["string_apple", "string_banana", "string_orange"]

desired_result = [["string", "apple"], ["string", "banana"], ["string", "orange"]]

My current attempt:

array.map(|r| r.split("_"))

Your current attempt is fine except that you should use curly braces for the block in map. . Note that it doesn't change the array. Maybe you just need to assign it to a variable. new_array = array.map { |r| r.split("_") } or if you want to use the same variable name array = array.map {|r| r.split("_") } — SteveTurczyn
– SteveTurczyn, Commented Dec 7, 2020 at 16:35
@SteveTurczyn There is no such syntax in ruby .map(|r| r.split("_")). Language Rust has that syntax. — Rajagopalan
– Rajagopalan, Commented Dec 7, 2020 at 16:37
Sure there is, except it needs curly braces as I said in my comment. — SteveTurczyn
– SteveTurczyn, Commented Dec 7, 2020 at 17:36

Timur Shtatland · Accepted Answer · 2020-12-07 16:40:26Z

3

You need map{...}, not map(...) for correct syntax in Ruby here:

array = ["string_apple", "string_banana", "string_orange"]

# Assign to a different array:
split_array = array.map{ |s| s.split(/_/) }

# Or modify the original array in place:
array.map!{ |s| s.split(/_/) }

# [["string", "apple"], ["string", "banana"], ["string", "orange"]]

edited Dec 7, 2020 at 16:40

answered Dec 7, 2020 at 16:33

Timur Shtatland

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2 Comments

Steve G Over a year ago

I had to add and exclamation to the map to override the array value .map!

Timur Shtatland Over a year ago

@SteveG Thank you for the comment! Added map! to the answer.

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