How to convert an array of string integers to an array of integers? Ruby

Question

I have an array:

all_ages = ["11", "9", "10", "8", "9"]

and I want to convert it to an array of integers to hopefully make it easier to add them all together. Any help greatly appreciated, looking for level one solutions.

spickermann · Accepted Answer · 2022-02-12 09:32:19Z

7

Enumerable#sum can be called with a block telling Ruby how to sum the elements of the array, in this case, to call String#to_i on element first.

all_ages = ["11", "9", "10", "8", "9"]
all_ages.sum(&:to_i)
#=> 47

answered Feb 12, 2022 at 9:32

spickermann

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Comments

Rajagopalan · Accepted Answer · 2022-02-12 08:57:19Z

3

all_ages = ["11", "9", "10", "8", "9"]

Code

p all_ages.map(&:to_i).sum

Or

p all_ages.map { |x| x.to_i }.sum

Output

edited Feb 12, 2022 at 8:57

answered Feb 12, 2022 at 8:49

Rajagopalan

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8 Comments

goatstash Over a year ago

You legend. You have no idea how long I've spent on this. Thank you!

goatstash Over a year ago

how else could p all_ages.map(&:to_i).sum be written out?

Jörg W Mittag Over a year ago

all_pages.sum(&:to_i)

user16452228 Over a year ago

I find the array.map {block} approach to be advantageous in that it also allows an easy way to replace x.to_i with Integer(x) if desired.

Jörg W Mittag Over a year ago

@MichaelB: You mean like array.sum(&method(:Integer))?

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