# 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.