Destructuring assignment
개념
unpack values from arrays, or properties from objects, into distinct variables.
Example
array basic
const foo = ['one', 'two'];
const [red, yellow, green, blue] = foo;
console.log(red) // one
console.log(yellow) // two
console.log(green) // undefinedswapping
const arr = [1, 2, 3];
[arr[2], arr[1]] = [arr[1], arr[2]];
console.log(arr); // [1, 3, 2]