Access elements by index (starting at ):
let colors = ["red", "green", "blue"]
console.log(colors[0]) // "red"
console.log(colors[1]) // "green"
console.log(colors[2]) // "blue"
console.log(colors[3]) // undefined
Accessing beyond the array returns undefined, not an error. The last element is at index length - 1:
console.log(colors[colors.length - 1]) // "blue"