Addition +,
Subtraction -,
Multiplication *,
Division /,
Remainder %,
Exponentiation **.

alert( 6 - '2' ); // 4, converts '2' to a number
alert( '6' / '2' ); // 3, converts both operands to numbers

Katta/kichik: a > b, a < b.
Katta/kichik yoki teng: a >= b, a <= b.
Teng: a == b, esda tutingki, qo'shaloq tenglik belgisi == tenglik testini bildiradi, bitta a = b esa topshiriqni bildiradi.
Teng emas: matematikada yozuv ≠, lekin JavaScript-da u != b shaklida yozilgan.

let year = prompt('In which year was the ECMAScript-2015 specification published?', '');

if (year < 2015) {
  alert( 'Too early...' );
} else if (year > 2015) {
  alert( 'Too late' );
} else {
  alert( 'Exactly!' );
}

let hour = 12;
let minute = 30;

if (hour == 12 && minute == 30) {
  alert( 'The time is 12:30' );
}

let i = 0;
while (i < 3) { // shows 0, then 1, then 2
  alert( i );
  i++;
}

break operatori switch blokini to'xtatadi.

switch berilgan qiymatni case lar bilan taqqoslaydi.
case lar qatorma-qator tekshiriladi va mos kelgan birinchi case bajariladi.
break operatori switch blokini to'xtatadi.
Agar hech qaysi case mos kelmasa, default bajariladi.

let func = (a, b) => a + b;

let func = function(arg1, arg2, ..., argN) {
  return expression;
};

function sayHello() {
    console.log("Hello!");
}
sayHello(); // "Hello!"