Named function expressions

nfe.js

/** 
 * When working with Named function expressions which one of the following is preffered and why?
 */

/* Use the same name for the function and the variable its assigned to.*/
var foo = function foo() {
  return foo;
}

/* Use a different name for the function and the variable its assigned to. */
var foo = function bar() {
  return bar;
}