text: /* While developing a website, you detect that some of the members have troubles logging in. 
  Searching through the code you find that all logins ending with a "_" make problems. So you want 
  to write a function that takes an array of pairs of login-names and e-mails, and outputs an array 
  of all login-name, e-mails-pairs from the login-names that end with "_".
  
  If you have the input-array:
  [ [ "foo", "foo@foo.com" ], [ "bar_", "bar@bar.com" ] ]
  
  it should output
  [ [ "bar_", "bar@bar.com" ] ]
  
  You have to use the filter-method which returns each element of the array for which the filter-method returns true.
  */
  
  //Solution following exercise instructions
  const searchNames = logins => logins.filter(name => name[0].endsWith('_'))
  
  //Different solution using '.slice'
  const searchNames = logins => logins.filter(login => login[0].slice(- 1) === '_')
  