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