SOURCE

// block scoped variables
n = [1, 2, 3, 4, 5]
for (let i = 0; i < n.length; i++) {
    console.log(n[i])
}
try {
    console.log('last position is: ' + i)
} catch(e) {
    console.log(e)
}

//const variable can not be changed
const ORG_NAME = 'YUTONG'
console.log(ORG_NAME)
try {
    ORG_NAME = 'YUTONG COOPERATE'
} catch(e) {
    console.log(e)
}