What is the difference between arrow functions and ordinary functions?

The differences are: 1. Arrow functions use arrows (=>) to define functions, the syntax is more concise, and the function keyword and braces are omitted. For example, (x) => x * 2 is a function expression represented by a simple arrow function, which is equivalent to the ordinary function function(x) { return x * 2; }; 2. The arrow function does not have its own this binding. It will inherit the this value of the outer scope. The this value of a normal function is determined based on the context when it is called, etc.

There are some differences in syntax and functionality between Arrow Function and Regular Function. The following are their main differences:

1. Concise syntax: Arrow functions use arrows (=>) to define functions, the syntax is more concise, and the function keyword and braces are omitted. For example, (x) => x * 2 is a function expression represented by a simple arrow function, which is equivalent to the ordinary function function(x) { return x * 2; }.

2. this binding: The arrow function does not have its own this binding, it will inherit the this value of the outer scope. The this value of a normal function is determined based on the context when it is called.

3. arguments object: Arrow function does not have its own arguments object, it will inherit the arguments object of the outer scope. Ordinary functions will create their own arguments object.

4. Constructor: Arrow functions cannot be used as constructors, and objects cannot be instantiated using the new keyword. Ordinary functions can be used as constructors to create object instances.

5. Arrow functions have no prototype attribute.

6. Arrow functions cannot change the direction of this through the call(), apply() or bind() methods.

In general, arrow functions are more suitable for simple function expressions and callback functions, while ordinary functions are more flexible and suitable for various scenarios, including as constructors, Change this to point to etc. You need to choose whether to use arrow functions or ordinary functions based on specific usage scenarios and requirements.

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