Is using the keyword var still viable in 2019/2020? What’s your use case for it? Is it only for older legacy code?
Is using the keyword var still viable in 2019/2020? What’s your use case for it? Is it only for older legacy code?
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Am I the only one who thinks const should be the only thing used?
I would like to note that const doesn't provide imutability, it only protects against reassignment
Ofcourse, const isn't enough, but it's a starting point
I'd argue you shouldn't add props to an object after you create it
I'd argue you should never have any value change (not in the foo = bar sense of change)
I am genuinely interested in your thoughts here
I use it. At the very least is useful for this kind of thing.
Why is it necessary to use
var
instead oflet
in your example? You don't accessstuff
variable incatch
block anyway.But I want to use it outside the try/catch block.
Just define it in the parent scope. It has extra line if compare with
var
, but I think this code is more obvious, because there is no implicit hoisting.That is what I'm trying to avoid. And you could still do the same with
var
.I choose to believe
var
's implicit hoisting is a feature and not a bug.I agree, this is a valid use case for
var
if you prefer implicit hoisting.I use
var
in devtools console, because withlet/const
I gotUncaught SyntaxError: Identifier 'foo' has already been declared
when re-declaring a variable.I use
var
out of habit when I'm typing something out real quick.My older projects use so many
vars
.I use var in console only, It lets me redefine and assign new value :P
I wanted to switch, but last I ran benchmarks against it, let ran considerable slower than var.
I'll test it again after the new year.
Negative. Clearly measurable differences in a highly optimized environment where performance is highly critical.
*** For fun, just did some performance testing. Right now I see no notable difference in performance between let and var. Yay, because I want to use let everywhere =)
Yes, I use it. Like, why wouldn't I?
Great run-through in this StackOverflow answer. They behave differently, it's important to know what the differences are. I find
let
clearer in almost every case, the only exception in my personal use has already been covered by other commenters - thetry/catch
thing doesn't really have a clean workaround usinglet
.