What does this declaration mean in javascript

Question

Consider the declarations of variable "x" and "y"

const x = 1;
   

const [y] = [1]

What is the meaning of 2nd declaration? Can someone suggest an article about such declaration type.

Answer 1

This is destructuring assignment.

You are unpacking values from arrays or object properties. In your above code, a const variable y will be defined with value 1.