What is the output of this code? Would anybody help me solve out?

Question

What is the output of this code?

let a = [1,3,5][2] ;
let b = [x:4, y:10].y ;
let c = ["199"][0] ;
console.log(a+b+c);

Answer 1

First look at Tibor Santa's correction note, <b> should be an object if we want to access its member by member-access operator (dot)

Output can only be 151 when <c> was declared as string, rather than an array.

[ "199" ] [ 0 ] yields "199", the first array element

"199" [ 0 ] yields "1" the first character

(Edit)

[ "199" ] [ 0 ] [ 0 ] also yields the first character from the first array element

You might be questioning the correctness of the code now that you see this ...

Answer 2

Syntax error. Your variable b is invalid.

If you fix it to be a javascript object (change to curly braces):

let b = {x: 4, y: 10}.y;

Then the result is:
5 + 10 + "199" = 15199

Answer 3

Sony Hossain You can always see the output of any code by running it. That's what Code Playground is for.

Answer 4

Sony Hossain I see.
Get used to be specific in the questions. When you need to understand how the code works, ask that. Don't leave that for the readers guesses.
Ah, always include a tag with the language name.

Answer 5

Thank you for your reply.. well I always use tags.. but this time I forgot to include the language name.. it might be a fault of mine.. next time I'd try to do so.. thanks! Emerson Prado

Answer 6

Thanks for your reply... Yeah I've already tried it in the playground.. it's 151 but how it comes up with this result.. wanted to know in details from sololearn experts.. thank you. Emerson Prado