lastDigitOfALargeNumber

Last digit of a large number

5 kyu link to kata
my solution

Examples

lastDigit("4", "1")            // returns 4
lastDigit("4", "2")            // returns 6
lastDigit("9", "7")            // returns 9    
lastDigit("10","10000000000")  // returns 0

Define a function that takes in two non-negative integers a a and b b and returns the last decimal digit of a b a b . Note that a a and b b may be very large!

For example, the last decimal digit of 9 7 9 7 is 9 9, since 9 7

4782969 9 7 =4782969. The last decimal digit of ( 2 200 ) 2 300 (2 200 ) 2 300

, which has over 1 0 92 10 92 decimal digits, is 6 6. Also, please take 0 0 0 0 to be 1 1.

You may assume that the input will always be valid.