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

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.