freeCodeCamp/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/es6/use-destructuring-assignment-to-pass-an-object-as-a-functions-parameters.english.md

id, title, challengeType, isHidden, forumTopicId

id	title	challengeType	isHidden	forumTopicId
587d7b8a367417b2b2512b4d	Use Destructuring Assignment to Pass an Object as a Function's Parameters	1	false	301217

Description

In some cases, you can destructure the object in a function argument itself. Consider the code below:

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 */
}

When profileData is passed to the above function, the values are destructured from the function parameter for use within the function.

Instructions

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

Tests

tests:
  - text: <code>stats</code> should be an <code>object</code>.
    testString: assert(typeof stats === 'object');
  - text: <code>half(stats)</code> should be <code>28.015</code>
    testString: assert(half(stats) === 28.015);
  - text: Destructuring should be used.
    testString: assert(code.replace(/\s/g, '').match(/half=\({\w+,\w+}\)/));
  - text: Destructured parameter should be used.
    testString: assert(!code.match(/stats\.max|stats\.min/));

Challenge Seed

const stats = {
  max: 56.78,
  standard_deviation: 4.34,
  median: 34.54,
  mode: 23.87,
  min: -0.75,
  average: 35.85
};

// Only change code below this line
const half = (stats) => (stats.max + stats.min) / 2.0; 
// Only change code above this line

Solution

const stats = {
  max: 56.78,
  standard_deviation: 4.34,
  median: 34.54,
  mode: 23.87,
  min: -0.75,
  average: 35.85
};

const half = ( {max, min} ) => (max + min) / 2.0;