node ecmascript2020 code example

Example 1: what is es11

let flowers =  ['lily', 'daisy', 'rose']

console.log(flowers[1]) // daisy

flowers = null

console.log(flowers[1]) // TypeError: Cannot read property '1' of null
console.log(flowers?.[1]) // undefined

Example 2: what is es11

console.log(flower.species?.lily) // undefined