operadores_logicos.js

!true = false  / !false = true  / !!false = false  / !!true = true  / !1 = true / !!1 = false / !0 = false / !!0 = true / !!""  = false

let x = 5 ;
let y = 9;

    x < 10 && x!==5 = false

    x>9 || x===5 = true

    !(x===y) = true

x = 10
y = "a"
    y==="b" || x>= 10 = true

x = 3
y = 8
    !(x == "3" || x === y) && !(y !== 8 && x <= y) = false

let str = ""
let msg = "haha!"
let eBonito = "false"
    !((str || msg) && eBonito) = false