freeCodeCamp/curriculum/challenges/en/02-javascript-algorithms-and-data-structures/es6/write-concise-declarative-functions-with-es6.en.md

id, title, challengeType

id	title	challengeType
587d7b8b367417b2b2512b50	Write Concise Declarative Functions with ES6	1

Description

When defining functions within objects in ES5, we have to use the keyword function as follows:

const person = {
  name: "Taylor",
  sayHello: function() {
    return `Hello! My name is ${this.name}.`;
  }
};

With ES6, You can remove the function keyword and colon altogether when defining functions in objects. Here's an example of this syntax:

const person = {
  name: "Taylor",
  sayHello() {
    return `Hello! My name is ${this.name}.`;
  }
};

Instructions

Refactor the function setGear inside the object bicycle to use the shorthand syntax described above.

Tests

- text: Traditional function expression was not used.
  testString: 'assert(!getUserInput(''index'').match(/function/),''Traditional <code>function</code> expression was not used.'');'
- text: <code>setGear</code> is a declarative function.
  testString: 'assert(typeof bicycle.setGear === ''function'' && getUserInput(''index'').match(/setGear\s*\(.+\)\s*\{/), ''<code>setGear</code> is a declarative function.'');'
- text: <code>bicycle.setGear(48)</code> changes the <code>gear</code> value to 48.
  testString: 'assert((new bicycle.setGear(48)).gear === 48, ''<code>bicycle.setGear(48)</code> changes the <code>gear</code> value to 48.'');'

Challenge Seed

// change code below this line
const bicycle = {
  gear: 2,
  setGear: function(newGear) {
    "use strict";
    this.gear = newGear;
  }
};
// change code above this line
bicycle.setGear(3);
console.log(bicycle.gear);

Solution

// solution required