You know JavaScript, but do you really know JavaScript? It's a great language, even though some may argue otherwise. Sure, it's got some bad parts,...
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The most important thing to understand about hoisting is that let and const don't have it. It's 2017, unless you are targeting very old browsers or working is some legacy code base, you should not use var ever again.
Thanks for the feedback Daniel!
That's true, ES6 is the future and is what most developers will be using moving forward. That said, it's not entirely true that hoisting doesn't apply to
letandconstvariables. It doesn't apply the same way as forvar, but theseletandconstvariables are still hoisted. The difference though is that they cannot be accessed until the assignment is done at runtime.From ES6's documentation:
At the end of the day, it's a small technicality where the interpreter applies hoisting to these variables on the compile run but they'll throw reference errors when accessed before the assignment happens, so your point is right :)
I'll update my post, thanks!
This is good stuff! Hoisting is definitely one of those language aspects that needs explanation.
I didn't have any hint that it was a thing besides seemingly inconsistent errors, but learned the details because of Douglas Crockford's opinionated JSLint tool telling me I needed to put my var declarations at the start of my functions.
Thanks Weston!
I agree that it's a very important part to understand, otherwise we won't understand why our code behaves certain ways on runtime. Douglas Crockford is definitely one of the best JS experts out there, along with Kyle Simpson in my opinion. I learned so much from the both of them.
Most excellent. Clear. Concise. Logical examples. Great work, thanks!
Thanks, appreciate that! Glad you enjoyed it.
This was great! Beginner friendly and clear explanation. I will share this with my students. Thanks for this.
Thank you Cesar!
That took some getting my head around but I understand it, thank you. A good nugget of knowledge worth remembering should a situation ever arise!
Thanks Andrew! Glad you found it helpful.
Fantastic article - thank you! I vaguely understood there was hoisting, but the use cases make the differences really clear.
Awesome, so glad you found it helpful!
Very cool. Did not know that.
Awesome, glad it was helpful! Thanks Anton.
Thanks Mauro!
Thanks for the great explanation. I'm new to JavaScript and this helps!
Very glad it helped you!
Nice ! I didn't know about it
Thanks, glad it was helpful!
This is great. Hoisting is an issue I ran into just yesterday.
Good to know the order in which things are hoisted. very useful.
Glad it helped :)