# Node.js destructure undefined

To simplify our code, Node.js offer **Destructure** syntax to de-strcuture the objects with properities. 

Meanwhile, ES6 offer **Defautl Function Paramerters** in case the parm not provided.

```js
const greet = (user='Fabio') =>{
    console.log('Hello', user);
}

greet('Richard')    // Hello Ricahrd
greet()             // Hello Fabio
```

To deal with objectes, there might be a chance that the object is undefined. In such case, the de-structure will hit error. 

```js
const product = {
    price: 200.00,
    name: 'iPhone 13',
    category: 'mobile'
}

const hello = ({price, name}) => {
    console.log(name, price);
}

hello(product)
hello() //TypeError: Cannot destructure property `price` of 'undefined' or 'null'.
```

To prevent such error, we could make sure of Default Function Parameters to assign default value in case error. Take note on the syntax `{price, name} = {}` which assign empty object for the properties. 

```js
const hello = ({price, name} = {}) => {
    console.log(name, price);
}
```