sum of numbers from 1 to n javascript code example

Example 1: sum of all numbers in an array javascript

const arrSum = arr => arr.reduce((a,b) => a + b, 0)

Example 2: prime numbers upto n in python

lower = int(input("Enter lower range: "))  
upper = int(input("Enter upper range: "))  
  
for num in range(lower,upper + 1):  
   if num > 1:  
       for i in range(2,num):  
           if (num % i) == 0:  
               break  
       else:  
           print(num)