freeCodeCamp/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/es6/use-class-syntax-to-define-a-constructor-function.english.md

---
id: 587d7b8b367417b2b2512b53
title: Use class Syntax to Define a Constructor Function
challengeType: 1
forumTopicId: 301212
---

## Description
<section id='description'>
ES6 provides a new syntax to create objects, using the <dfn>class</dfn> keyword.
It should be noted that the <code>class</code> syntax is just syntax, and not a full-fledged class-based implementation of an object-oriented paradigm, unlike in languages such as Java, Python, Ruby, etc.
In ES5, we usually define a constructor function and use the <code>new</code> keyword to instantiate an object.

```js
var SpaceShuttle = function(targetPlanet){
  this.targetPlanet = targetPlanet;
}
var zeus = new SpaceShuttle('Jupiter');
```

The <code>class</code> syntax simply replaces the constructor function creation:

```js
class SpaceShuttle {
  constructor(targetPlanet) {
    this.targetPlanet = targetPlanet;
  }
}
const zeus = new SpaceShuttle('Jupiter');
```

It should be noted that the <code>class</code> keyword declares a new function, to which a constructor is added. This constructor is invoked when <code>new</code> is called to create a new object.<br>
<strong>Notes:</strong><br><ul>
<li> UpperCamelCase should be used by convention for ES6 class names, as in <code>SpaceShuttle</code> used above.</li>
<li> The constructor method is a special method for creating and initializing an object created with a class. You will learn more about it in the Object Oriented Programming section of the JavaScript Algorithms And Data Structures Certification.</li></ul>
</section>

## Instructions
<section id='instructions'>
Use the <code>class</code> keyword and write a constructor to create the <code>Vegetable</code> class.
The <code>Vegetable</code> class allows you to create a vegetable object with a property <code>name</code> that gets passed to the constructor.
</section>

## Tests
<section id='tests'>

```yml
tests:
  - text: <code>Vegetable</code> should be a <code>class</code> with a defined <code>constructor</code> method.
    testString: assert(typeof Vegetable === 'function' && typeof Vegetable.constructor === 'function');
  - text: <code>class</code> keyword should be used.
    testString: assert(code.match(/class/g));
  - text: <code>Vegetable</code> should be able to be instantiated.
    testString: assert(() => {const a = new Vegetable("apple"); return typeof a === 'object';});
  - text: <code>carrot.name</code> should return <code>carrot</code>.
    testString: assert(carrot.name=='carrot');

```

</section>

## Challenge Seed
<section id='challengeSeed'>

<div id='js-seed'>

```js
/* Alter code below this line */

/* Alter code above this line */

const carrot = new Vegetable('carrot');
console.log(carrot.name); // => should be 'carrot'
```

</div>



</section>

## Solution
<section id='solution'>

```js
class Vegetable {
  constructor(name) {
    this.name = name;
  }
}
const carrot = new Vegetable('carrot');
```

</section>