Complete the function/method so that it takes CamelCase string and returns the string in snake_case notation. Lowercase characters can be numbers. If method gets number, it should return string. Examples: # returns test_controller to_underscore('TestController') # returns movies_and_books to_underscore('MoviesAndBooks') # returns app7_test to_un…

toUnderScore.js

function toUnderscore(string) {
  return string.toString().replace(/[A-Z]/g,function(element, index){
  element = element.toLowerCase();
  return index == 0 ? element :'_'+ element
  });
}