Question

Trim leading and trailing spaces from name “undefined”.

trimName accepts a person as an argument. Person will always be an object. Return undefined if name is not defined. Otherwise, return a trimmed name.

var person = {};
var trimmedName;
person.name;
function trimName(person) {
  // If you do not set this variable to a value, it will be
  // undefined.
  // Do a check here to see if a person's name is defined.
  if (person.name = 'undefined') {
    return 'undefined';
  }
  else {
    trimmedName = person.name.trim();
    return trimmedName;
  }
}
trimName(' sam ');

Answer 1

Ï don’t see a question there… but I see issues with the code:

• You are using the assignment operator = where you should use the comparison operator ==.
• Comparing a string to the string 'undefined' is not the way to check if an property is undefined.
• The trim method only exists in the latest version (9) of IE.
• You are calling the function with a string instead of an object.

Code:

function trimName(person) {
  var trimmed;
  if (typeof person.name == 'undefined') {
    trimmed = 'undefined';
  } else {
    trimmed = person.name.replace(/(^\s+|\s+$)/g, '');
  }
  return trimmed;
}

var trimmedName = trimName({ name: ' sam ' });

Demo: http://jsfiddle.net/Guffa/vCkSq/