🔣question (?)

punctuator '(' and ')'

JS ⟩ grammar ⟩ token ⟩ punctuator ⟩ question (?)

🔴 主題

• optional chaining (?., ?.[]) - obj ?. prop, obj ?. [prop]

• optional invocation ?.() - f ?. ()

• conditional operator (?:) - condition ? a : b

• nullish coalescing (??) - optional ?? default