Can Arrow Functions in ES2015 Be Named Without `var` or `const`?

How do I Name Arrow Functions in ES2015?

In ES2015, arrow functions are an elegant way to write concise functions, but you may wonder if it's possible to assign them a name without the traditional var or const syntax.

Consider the following named function:

function sayHello(name) {
    console.log(name + ' says hello');
}

To convert this to an arrow function, one might initially assume that a named arrow function would look something like this:

var sayHello = (name) => {
    console.log(name + ' says hello');
}

However, this approach requires the use of a var statement, which may not be desirable.

The solution lies in assign the arrow function to a variable or property initializer. By doing so, the variable or property name can act as a name for the arrow function. For instance, the following code is perfectly valid:

sayHello = (name) => {
    console.log(name + ' says hello');
}

Like traditional anonymous function expressions, arrow functions assigned in this manner inherit the name of the variable or property they are assigned to. To demonstrate this, consider the following code:

const sayHello = (name) => {
    console.log(name + ' says hello');
};
console.log(sayHello.name); // "sayHello"

In this example, the arrow function has a true name, sayHello, which can be retrieved using the .name property.

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