ES6 - Use Destructuring Assignment to Assign Variables from Arrays

JavaScript
1

Tell us what’s happening:
I have tried the following code but the test isn’t passing, upon checking the code in the console, it says

Uncaught SyntaxError: Identifier ‘a’ has already been declared

I thought we can re-declare a as it is let. I am very confused.

Your code so far

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

Your browser information:

User Agent is: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/105.0.0.0 Safari/537.36

Challenge: ES6 - Use Destructuring Assignment to Assign Variables from Arrays

Link to the challenge:

2

this is declaring variables a and b, giving an error as those are already declared
you can use destructuring without declaring the variables, but using already declared variables

3

You can not redeclare let variables inside the same scope. You can reassign their values, not redeclare them.

let uniqueIdentifier = 'Dynamic value';
let uniqueIdentifier; // SyntaxError: Identifier 'uniqueIdentifier' has already been declared

{
  let uniqueIdentifier = 'New Scope'
  console.log(uniqueIdentifier); // New Scope
}

Just as an aside. The Chrome console allows for let variables to be redeclared. It is meant as a convenience. But if you run both lines of code at the same time it will still throw an error.

4

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