Syntax and Conciseness:
Regular Functions: Traditional functions are defined using the function keyword, followed by a name, parameters, and a function body enclosed in curly braces.
function multiply(num1, num2) {
const result = num1 * num2;
return result;
}
Arrow Functions: Arrow functions provide a more concise syntax. They use the => (fat arrow) notation and omit the function keyword and curly braces for single-line functions.
const multiply = (num1, num2) => num1 * num2;
Arguments Object:
Regular Functions: Regular functions have an arguments object that contains the arguments passed when the function is called. You can access individual arguments using indices (e.g., arguments[0], arguments[1]).
Arrow Functions: Arrow functions do not have their own arguments object. If you attempt to use arguments within an arrow function, you’ll encounter a reference error.
this Binding:
Regular Functions: Regular functions create their own this context dynamically based on how they are called. The value of this depends on the calling object.
const obj = {
name: 'deeecode',
print: function() {
console.log(this); // Refers to the 'obj' object
}
};
obj.print();
Arrow Functions: Arrow functions do not create their own this context. Instead, they capture the this value from the surrounding lexical context where they were created.
const obj = {
name: 'deeecode',
print: function() {
const print2 = () => {
console.log(this); // Still refers to the 'obj' object
};
print2();
}
};
obj.print();
Scoping and Hoisting:
Regular Functions: Regular functions have their own scope and are hoisted to the top of their containing scope during execution.
Arrow Functions: Arrow functions use the scope of the surrounding code and are not hoisted.
In summary, arrow functions are concise, lack an arguments object, and do not create their own this binding. Regular functions offer more flexibility but come with slightly more verbose syntax.