JS Interview - ASI - Question 5

This is the fifth episode of the JavaScript Interview Question Series.

[Rangerali]

Thank you for this series, amazing work.

[njamdagani]

At Time(3:50)

'let' is not hoisted. 'a' would have been undefined if you have used 'var'. In the current case, output will be that 'a is not defined'.

[DmitriyMalayevProfile]

Hello Steve, thanks again for the best educational videos.
Question, I'm using Quokka and when I try to follow along and type

let obj = {a:123}
[obj].forEach()

I get Cannot access 'obj' before initialization error. is this supposed to be like that? Thanks

[andrescastillo]

Hi @Steve Griffith.
At 5:08, if its' trying to find the object's key of undefined, should the word undefined be in quotes, since undefined is not a variable. Kind of the way you did at 2:50?

[DmitriyMalayevProfile]

Please explain

console
.log("First line")
[("a", "b", "c")].forEach((element) => console.log(element));
console.log("Third line");

[shujaatali]

Don't the compiler understand the new line to be end of statement without semicolon.

[weaknessToGreatness]

I don´t get at all what is [a]. Never heard of calling an object like that. Could you explain this man?

[rishabarya]

Does variable declared with 'let' keyword are hoisted? I guess only variables with 'var' are hoisted.