Need help on "Use Destructuring Assignment to Assign Variables from Objects"

Need help on "Use Destructuring Assignment to Assign Variables from Objects"
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#1

I’m learning destructuring assignment topic, but the instruction page is a little confusing. can someone explain what I have to do. Seem my problem comes from the return-assignment.

Your code so far


function getLength(str) {
  "use strict";

  // change code below this line
  const {length:a}=str;
  console.log(a); // change this
  // change code above this line
  return ({len}={len:a}); // you must assign length to len in line
  console.log(len);
}

console.log(getLength('FreeCodeCamp'));

Your browser information:

User Agent is: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/67.0.3396.87 Safari/537.36.

Link to the challenge:
https://learn.freecodecamp.org/javascript-algorithms-and-data-structures/es6/use-destructuring-assignment-to-assign-variables-from-objects


#2

Figured out how it works , the comment on code editor made me confusing It should be “you must assign length to len on line 5”

function getLength(str) {
  "use strict";

  // change code below this line
  const {length:len} = str; // change this
  // change code above this line

  return len; // you must assign length to len in line *5

}

console.log(getLength('FreeCodeCamp'));