How to sum array of numbers in Ruby?

Question

I have an array of integers.

For example:

array = [123,321,12389] 

Is there any nice way to get the sum of them?

I know, that

sum = 0 array.each { |a| sum+=a } 

would work.

Answer 1

For ruby >= 2.4 you can use sum:

array.sum

For ruby < 2.4 you can use inject:

array.inject(0, :+) 

Note: the 0 base case is needed otherwise nil will be returned on empty arrays:

> [].inject(:+) nil > [].inject(0, :+) 0