code: function koalas() {
    var len = arguments.length;
    var arg;
    for (var i = 0; i < len; i++) {
      arg = arguments[i];
      if (hasValue(arg)) {
        return arg;
      }
    }
    return arg;
  }
docs: Coalesce function to find the first valid value.
  A valid value is one that is not undefined, not null and not NaN (not a number).
  If no values are valid, then the last argument is returned.
  
  ```js
  console.log(koalas(undefined, null, NaN, 'a', 'b'));
  //=> 'a'
  
  console.log(koalas(undefined, null, NaN, {a: 'b'}, 'b'));
  //=> {a: 'b'}
  
  console.log(koalas(undefined, null, NaN, ['a', 'b', 'c'], {a: 'b'}, 'b'));
  //=> ['a', 'b', 'c']
  
  console.log(koalas(undefined, NaN, null));
  //=> null
  ```
  @name koalas
  @param {Mixed} `arguments` Pass in any amount of arguments.
  @return {Mixed} First valid value.
  @api public