const nestedArray = [['😉'],['😊'],['😇']]
const nestedCopyWithSpread = [...nestedArray] // The spread operator makes a shallow copy

nestedArray[0][0] = '😡' // Whoops, a bug

console.log(...nestedArray) // 😡 😊 😇
console.log(...nestedCopyWithSpread) // 😡 😊 😇

// A deep copy would require a library like lodash or Ramda's R.clone() method