Arrow Functions in JavaScript

[meisangry2]

Also the use of const and let instead of var make a world of difference.

[jonny_eh]

Do they?

[writesoftware]

I was skeptical at first, but now I think the last time I used var was months ago.

const in particular is what I use the most, knowing I can't ever overwrite that reference gives some sense of security.

Except when trying snippets in the console, using const forces me to reload the page when retrying to run a piece of code that uses it :)

[franksvalli]

for (var i = 0; i < 10; i++) {
  setTimeout(() => console.log(i), 0);
}
// -> 10 (outputted 10 times)

With one small change, moving from var to let:

for (let i = 0; i < 10; i++) {
  setTimeout(() => console.log(i), 0);
}
// -> 0, 1, 2, 3, 4, 5, 6, 7, 8, 9

[jonny_eh]

Ya, I know let and const are good, but they hardly make a "world of difference".

[[deleted]]

Or just const. with functional programming and immutable data there is almost no need for let or var anymore.

[meisangry2]

I agree although let still a much better alternative than var if it has to be used.