Theory

In some cases, you can destructure the object in a function argument itself.

Check out this code:

const profileUpdate = (profileData) => {
  const { name, age, nationality, location } = profileData;
  // do something with these variables
}

This effectively destructures the object sent into the function. This can also be done in-place:

const profileUpdate = ({ name, age, nationality, location }) => {
  /* do something with these fields */
}

This removes some extra lines and makes our code look neat.

This has the added benefit of not having to manipulate an entire object in a function; only the fields that are needed are copied inside the function.

Task

Use destructuring assignment within the argument to the function half to send only max and min inside the function.

const stats = {
  max: 56.78,
  standard_deviation: 4.34,
  median: 34.54,
  mode: 23.87,
  min: -0.75,
  average: 35.85
};
const half = (function() {
  "use strict"; // do not change this line

  // change code below this line
  return function half(stats) {
    // use function argument destructuring
    return (stats.max + stats.min) / 2.0;
  };
  // change code above this line

})();
console.log(stats); // should be object
console.log(half(stats)); // should be 28.015

Task Conditions to be satisfied

  • stats should be an object.
  • half(stats) should be 28.015
  • Destructuring was used.

Solution


const stats = {
  max: 56.78,
  standard_deviation: 4.34,
  median: 34.54,
  mode: 23.87,
  min: -0.75,
  average: 35.85
};
const half = (function() {
  "use strict"; // do not change this line

  // change code below this line
  return ({max, min}) => { // use function argument destructuring
    return (max + min) / 2.0;
  }
  // change code above this line

})();
console.log(stats); // should be object
console.log(half(stats)); // should be 28.015

Notes