let x = 0 x + 1.2
let x = false x + "false"
let x=0 let x=7
let x=[1, 2] x[7, 9]
let x = 0 x = 3.2
let x = 0 x = 7
let x=[1, 2] x[0] = 3.2
let x=[3, 4] x[0] = 7