Why are the arrow functions in ES6 declared always as "const" and can it be done as a "var" or "let?

Question

Arrow functions always const?

Answer 1

[Arrow Functions:]

Arrow functions have two main aspects:
their structure and their this binding.

They can have a much simpler structure than traditional functions because they don't need the 'function' key word, and they automatically return whatever is after the arrow.
For example,

var foo = function( a, b ) {
return a * b;
}

let bar = ( a, b ) => a * b;

https://www.sololearn.com/post/48576/?ref=app
https://www.sololearn.com/Discuss/1600345/?ref=app
https://www.sololearn.com/Discuss/1601369/?ref=app

[ES6:] Tips & Tricks to make your code cleaner, shorter, and easier to read!
https://www.sololearn.com/post/48506/?ref=app
[ES6:] Cool stuffs - A big fat Arrow
https://medium.com/front-end-hacking/es6-cool-stuffs-a-big-fat-arrow-c01e3d7b5357

[Edited:] Using 'const'
Variables declared with 'var' or 'let' can be changed later on in the program, and
reassigned. A once a 'const' is initialized, its value can never be changed again, and it can't be reassigned to a different value.

Answer 2

They can be declared as variables too but it is a good practice to declare them as constants.

Answer 3

It's good practice to declare them as consts because this is a way to signify to the reader that they are generally not changed or you don't plan to reassign them to another value later.

see this answer for more https://stackoverflow.com/questions/42275425/benefit-of-const-vs-let-in-typescript-or-javascript

Answer 4

Yes you can. The use of const keyword is to ensure that the function would not change by any means.

Answer 5

This is due to the hoisting. It forces you to define your functions before using them.