How to do sum of array numbers in Ruby with examples

How to do sum of array numbers in Ruby with examples

This tutorial explains how to do the sum of array numbers in Ruby.

  • Sum of array numbers
  • Sum of numbers between a and b

Ruby sum of array numbers with an example

There are a number of ways we can calculate the sum of an array of numbers in Ruby

  • sum method
  • reduce method
  • inject method

sum method

The sum method is only available in the Ruby 2.4 version onwards. It returns the sum of all elements. It returns 0 if the array is empty. It added an enumerable type and was used with Arrays.

If the array is a string, It returns by appending all elements.

Here is an example

numbers = [1,2,3,4]
result = numbers.sum
puts "#{result}"

result1=0
numbers.sum {|item| result1+=item  }
puts "#{result1}"

result2=numbers.sum {|item| item  }
puts "#{result2}"

Output

10
10
10

reduce method

reduce method reduces the array of elements into a single value.

numbers = [1,2,3,4,5]
result=numbers.reduce(0, :+)
puts "#{result}"

result1=numbers.reduce(:+)
puts "#{result1}"

Output

10

inject method

inject method combine all elements with a given binary operation.

inject and reduce functions behavior are the same. used with the below ruby 2.4 version only.

Here is an example

numbers = [1,2,3,4,5]
result=numbers.inject(0, :+)
puts "#{result}"

result1=numbers.inject(:+)
puts "#{result1}"

Sum of numbers between two numbers in Ruby

For example, Two numbers are 1, 10. This program returns the sum of all numbers from 1 to 10.

def sum(first,second)
    first, second = second, first if first > second
    return (first..second).sum
end
print sum(1,10)

Output:

55

Conclusion

Learned multiple ways to sum of array numbers, between two numbers in Ruby and rails language.