freeCodeCamp/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/es6/use-destructuring-assignment-to-extract-values-from-objects.md

id, title, challengeType, forumTopicId, dashedName

id	title	challengeType	forumTopicId	dashedName
5cfa550e84205a357704ccb6	Use Destructuring Assignment to Extract Values from Objects	1	301216	use-destructuring-assignment-to-extract-values-from-objects

--description--

Destructuring assignment is special syntax introduced in ES6, for neatly assigning values taken directly from an object.

Consider the following ES5 code:

const user = { name: 'John Doe', age: 34 };

const name = user.name;
const age = user.age;

name would have a value of the string John Doe, and age would have the number 34.

Here's an equivalent assignment statement using the ES6 destructuring syntax:

const { name, age } = user;

Again, name would have a value of the string John Doe, and age would have the number 34.

Here, the name and age variables will be created and assigned the values of their respective values from the user object. You can see how much cleaner this is.

You can extract as many or few values from the object as you want.

--instructions--

Replace the two assignments with an equivalent destructuring assignment. It should still assign the variables today and tomorrow the values of today and tomorrow from the HIGH_TEMPERATURES object.

--hints--

You should remove the ES5 assignment syntax.

assert(
  !__helpers
    .removeJSComments(code)
    .match(/today\s*=\s*HIGH_TEMPERATURES\.(today|tomorrow)/g)
);

You should use destructuring to create the today variable.

assert(
  __helpers
    .removeJSComments(code)
    .match(
      /(var|let|const)\s*{\s*(today[^}]*|[^,]*,\s*today)\s*}\s*=\s*HIGH_TEMPERATURES(;|\s+|\/\/)/g
    )
);

You should use destructuring to create the tomorrow variable.

assert(
  __helpers
    .removeJSComments(code)
    .match(
      /(var|let|const)\s*{\s*(tomorrow[^}]*|[^,]*,\s*tomorrow)\s*}\s*=\s*HIGH_TEMPERATURES(;|\s+|\/\/)/g
    )
);

today should be equal to 77 and tomorrow should be equal to 80.

assert(today === 77 && tomorrow === 80);

--seed--

--seed-contents--

const HIGH_TEMPERATURES = {
  yesterday: 75,
  today: 77,
  tomorrow: 80
};

// Only change code below this line

const today = HIGH_TEMPERATURES.today;
const tomorrow = HIGH_TEMPERATURES.tomorrow;

// Only change code above this line

--solutions--

const HIGH_TEMPERATURES = {
  yesterday: 75,
  today: 77,
  tomorrow: 80
};

const { today, tomorrow } = HIGH_TEMPERATURES;