➕nullish coalescing (??)
🚧 under construction
JS ⟩ statement ⟩ expression ⟩ operator ⟩ logical ⟩ nullish coalescing operator (??)
?? operator
the precedence of
??relative to||,&&is not defined.explicitly use parentheses if
??is mixed with||,&&.
??may be used after optional chaining (?., ?.[]) to provide a default value.
// ⭐️ nullish coalescing
x = x ?? 100;
// polyfill
x = (x !== undefined && x !== null) ? x : 100;
// ❗️ slightly different from:
x = x || 100;問：「 Google Apps Script 支援 nullish coalescing 嗎？」
答：「 測試過，看來是支援的。」
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