---
id: 587d7b8b367417b2b2512b50
title: Write Concise Declarative Functions with ES6
challengeType: 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
```yml
tests:
- text: Traditional function expression should not be used.
testString: getUserInput => assert(!removeJSComments(code).match(/function/));
- text: setGear should be a declarative function.
testString: assert(typeof bicycle.setGear === 'function' && code.match(/setGear\s*\(.+\)\s*\{/));
- text: bicycle.setGear(48) should change the gear value to 48.
testString: assert((new bicycle.setGear(48)).gear === 48);
```
## Challenge Seed
```js
// change code below this line
const bicycle = {
gear: 2,
setGear: function(newGear) {
this.gear = newGear;
}
};
// change code above this line
bicycle.setGear(3);
console.log(bicycle.gear);
```
### After Test
```js
const removeJSComments = str => str.replace(/\/\*[\s\S]*?\*\/|\/\/.*$/gm, '');
```
## Solution
```js
const bicycle = {
gear: 2,
setGear(newGear) {
this.gear = newGear;
}
};
bicycle.setGear(3);
```