JS Interview - dot notation vs square brackets - Question 12

This episode discusses the differences between dot notation syntax and square bracket syntax.
Full Interview question playlist: • JS Interview - Timeout...
Starter Code GIST: gist.github.co...

[@apex-lazer]

You are gold. Seriously. You somehow make things click and are so easy and enjoyable to listen to and learn from. ☝️ From the bottom of my heart. Thank you brother 🙏

[@MsRamrad]

It's a shame that I did not discover your channel earlier. You have a gift for breaking down and explaining concepts really well.

[@SteveGriffith-Prof3ssorSt3v3]

Thanks. Please share the channel to help others discover it

[@johnclampet4497]

Just made my life a lot easier... just started in Javascript yesterday I also appreciate the Supernatural reference!

[@wambuafredrick6881]

The voice instills the knowledge :)

[@elilumilay9405]

Such a calm voice. Perfect for a coding professor! :D thank you Steve. I came here after encountering a same topic in freecodecamp

[@liberato09]

Wow that was really well explained. thx my dude. your dog ear slapping in the background cracked me up at the end

[@abdelmoneimnafea8498]

Such an amazing series ... thanks Steve

[@aricwilliamsdeveloper]

lol wow! professor steve breaks it down like a chiropractor! liked & subscribed

[@mattparkinson3954]

Thankyou for this simplified explanation, really helpful! I shall be subscribing and watching more of your videos.

[@leroyal8510]

Woah! I love programming and I love SUPERNATURAL too!

[@raychard123]

Hears "Dean" and "Sam" while landing on your page within 5 seconds. Like button Smashed!! #Supernaturalfam.

[@mohpish]

Amazing explanation... couldn't do anything else but to subscribe... thank you

[@sashab4432]

The reason why last one won't work is because the last 'castiel' is not a string. it's 'value' is undefined. so it will search by its value, & not by its name. We need to search by its name. So if we search it as a string 'castiel', then we will get the result.

[@eminm6383]

very nice & clear explanation. Loved.

[@gomogovo4966]

I'll be damned if that is not a "reference" to Supernatural...

[@nicolaregiacorte8328]

Right to the point as always, thank you good Sir! =)

[@EugeneVilder]

I'm a fan of Supernatural too :) Dean rules... Tnx for your videos.

[@frank3481]

Hi 4:04 Line 16, isn't it "not defined" instead of "undefined"? so even if you have undefined property inside "sam", it would still make ReferenceError errors.

[@kamalsharma2839]

I am also thinking same

[@njamdagani]

At 4:23 castiel is not defined, you said it is undefined ?

[@SteveGriffith-Prof3ssorSt3v3]

Yes. you are correct. `castiel` will be not defined in the last statement and that will be the reason for the failure of that line.

[@21rogerwaters]

Steve, the first two console.log should return an error like the third one, but it doesn't 🤔: let dataTypes = { null: 'oi', undefined: 'olá', object: 'hhhhh' } console.log(dataTypes[null]) // => 'oi' - it works (why?) console.log(dataTypes[undefined]) // => 'olá' - it works (why?) console.log(dataTypes[object]) // => Uncaught ReferenceError: object is not defined - it did'n work (as espected)

[@SteveGriffith-Prof3ssorSt3v3]

null - is a keyword undefined - is a keyword object - is not a keyword. Therefore using `object` as a key in the object means a reference error. If you used `Object` as the key then you would be referring to the constructor function Object...meaning no error. All Object keys are strings. So, null becomes "null". undefined becomes "undefined". Object becomes "Object". Then all three could store a value.

[@21rogerwaters]

​@@SteveGriffith-Prof3ssorSt3v3 it makes sense. Thank you so much Steve 🙏

[@kamalsharma2839]

Why Castiel would be undefined in last one ???

[@SteveGriffith-Prof3ssorSt3v3]

because there is no variable called castiel.

[@abdulazeezatanda2371]

Do you use an extension on VSCode that makes your triple equals === and arrow notations => show differently?

[@SteveGriffith-Prof3ssorSt3v3]

It is the Jet Brains Mono font in my theme

[@abdulazeezatanda2371]

@@SteveGriffith-Prof3ssorSt3v3 Thanks

[@doniaelfouly4142]

thanks

[@JohnDoe-rj2kf]

Dammit Sammy!

[@RedEyedJedi]

four* log statements. Was that part of the test? haha

[@hiro6164]

nice

[@quietackshon]

_Off topic_ 4:54 What was that sound?

[@SteveGriffith-Prof3ssorSt3v3]

Wet dog shaking itself and its ears slapping the sides of its head.

[@quietackshon]

@@SteveGriffith-Prof3ssorSt3v3 Never would've picked it.