ES6: Use Destructuring Assignment to Assign Variables from Arrays - Valid code doesn't pass?

JavaScript
1

Why does this code not pass the test?

The official solution seems to create an array without declaring it. I’ve seen this technique used before, but how can I learn more about it? Is it unique to Javascript?

let a = 8, b = 6;
// change code below this line
let arr = [a, b];
[b, a] = arr;

// change code above this line
console.log(a); // should be 6
console.log(b); // should be 8
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2

It is a valid solution, but the FCC tests for this challenge are not robust enough to handle the extra variable *arr being used. I will see if I can modify the test to be more flexible.

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4

It’s fairly widespread, with slight differences in what’s allowed between languages. Ones I can think of + bit of googling gives me PHP, Python, Perl, Ruby, various Lisps, Go, most functional languages (eg ML style like Haskell/SML/OCaml, or BEAM languages like Erlang/Elixir), languages that have absorbed stuff from functional languages (notably C# and Rust, Swift, Kotlin)

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