1. Arrow functions are more concise than regular functions, making code more readable. For example:
// Regular Function
const add = function(a, b) {
return a + b;
};
// Arrow Function
const add = (a, b) => a + b;
2. Arrow functions do not create their own this context, which means they can access the this value of the enclosing context. For example:
// Regular Function
const myObj = {
name: ‘John’,
sayName: function() {
console.log(this.name);
}
};
// Arrow Function
const myObj = {
name: ‘John’,
sayName: () => console.log(this.name)
};
3. Arrow functions are automatically bound to the parent context, which means they can be used as callbacks or in methods like map, filter, and reduce. For example:
// Regular Function
const numbers = [1, 2, 3, 4, 5];
const doubled = numbers.map(function(number) {
return number * 2;
});
// Arrow Function
const numbers = [1, 2, 3, 4, 5];
const doubled = numbers.map(number => number * 2);
4. Arrow functions do not have their own arguments object, so they can’t be used as constructors. For example:
// Regular Function
function Person(name) {
this.name = name;
}
// Arrow Function
const Person = name => {
this.name = name;
};
5. Arrow functions are always anonymous, which means they can’t be used as object methods. For example:
// Regular Function
const person = {
name: ‘John’,
sayName: function() {
console.log(this.name);
}
};
// Arrow Function
const person = {
name: ‘John’,
sayName: () => console.log(this.name)
};
6. Arrow functions do not have a prototype property, so they can’t be used as constructors. For example:
// Regular Function
function Person(name) {
this.name = name;
}
Person.prototype.sayName = function() {
console.log(this.name);
};
// Arrow Function
const Person = name => {
this.name = name;
};
Person.prototype.sayName = () => console.log(this.name);
7. Arrow functions cannot be used as generators. For example:
// Regular Function
function* generator() {
yield 1;
yield 2;
yield 3;
}
// Arrow Function
const generator = () => {
yield 1;
yield 2;
yield 3;
};
8. Arrow functions are always anonymous, which makes them difficult to debug. For example:
// Regular Function
const add = function(a, b) {
return a + b;
};
// Arrow Function
const add = (a, b) => a + b;
9. Arrow functions cannot be used as async functions. For example:
// Regular Function
async function getData() {
const response = await fetch(‘https://example.com/data’);
return response.json();
}
// Arrow Function
const getData = async () => {
const response = await fetch(‘https://example.com/data’);
return response.json();
};