/**
 * 
 * Ashish Patel
 * e: ashishsushilPatel@gmail.com
 * w: https://ashish.me
 *
 */

/* 
Note: Write a solution that only iterates over the string once and uses O(1) additional memory, since this is what you would be asked to do during a real interview.

Given a string s, find and return the first instance of a non-repeating character in it. If there is no such character, return '_'.

Example

For s = "abacabad", the output should be firstNotRepeatingCharacter(s) = 'c'.
There are 2 non-repeating characters in the string: 'c' and 'd'. Return c since it appears in the string first.

For s = "abacabaabacaba", the output should be firstNotRepeatingCharacter(s) = '_'.
There are no characters in this string that do not repeat.
*/ 

function firstNotRepeatingCharacter(value) {
  return value
}

test('first Not Repeating Character', () => {
  expect(firstNotRepeatingCharacter('Ashish')).toEqual('Ashish')
});