Operators & Expressions

Arithmetic, comparison, logical, bitwise, assignment, and ternary operators.

Operator	Example	Meaning
+ - * / %	5 * 2	arithmetic
=== !==	a === b	strict equality
&& ||	a && b	logical AND / OR
?:	cond ? a : b	ternary (inline if)
??	a ?? b	nullish coalescing
?.	obj?.prop	optional chaining

---

Example: Nullish coalescing vs logical OR

let foo = 0;
console.log(foo || 42);   // 42 (because 0 is falsy)
console.log(foo ?? 42); // 0  (nullish coalescing only for null/undefined)