Javascript Function.name

// function definition
function greeting() {
  console.log("Nice to meet you!");
}

// returns the name of the greeting() function
console.log(greeting.name);

// Output: greeting

name Syntax

The syntax of the name property is:

func.name

Here, func is a function.

name Parameters

The name property does not take any parameters.

name Return Value

The name property returns the function's name as specified when it was created.

Note: If the function is created anonymously, the length property returns anonymous or ''.

Example 1: Using name Property

// function definition 
function message() {
       console.log("Hello World")
}

// returns the name of the message() function
console.log(message.name);

Output:

message

In the above program, we have defined a function named message(). We are using the name property to find out the name of the function that we have defined.

Using name as message.name returns the name of the function message() i.e. message.

Example 2: name Property for Anonymous Function

Anonymous function is a function that is created without a name.

We declare anonymous functions without using an identifier. We can create an anonymous function with new Function(..) or Function(..) syntax.

Using the name property in an anonymous function returns anonymous keyword. For example:

// name property for anonymous function
console.log((new Function).name);
 

// assigning anonymous function to a variable 'x'
const result = function() {
    }

// using name property in the 'result' variable 
console.log(result.name);

Output

anonymous
result

In the above program, we have assigned an anonymous function to a variable named result.

The function is inferred as the variable name. So, using name in result returns the variable name- "result".

Example 3: Using name Property in a Variable

// function definition 
function func() {
}

// assigning the value of 'func' to a variable 'result'
let result = func;

// using name property in the 'result' variable 
console.log(result.name);

Output

func

Here, we have assigned the value of func() to a variable named result. So result.name returns the name of the func() function i.e. func.

Recommended Reading: JavaScript Function.length