⭐computed property name

🚧 under construction

JS ⟩ values ⟩ object ⟩ property ⟩ name ⟩ computed

⭐️ ES6 (2015)

🚧

⭐️ 重點

• it's the name of the property that is computed, not the value of the property.

• don't confuse with a computed property in Swift, which is the value of the property that is computed.

👥 相關

• use bracket notation [] to compute the property name.

• member. (what's this?) 🚧

• object property

• the name of the make-iterator method of an iterable object is a computed property name (i.e. [Symbol.iterator]).

💈範例

let p = {
    [`p${1}`]: 1,    // ⭐️ computed property name:
    ['p' + 2]: 2,    // any JS expression in [ ... ]
};

p.p1 + p.p2    // 3

📗 參考

• JS.info ⟩ computed names

• JavaScript: The Definitive Guide ⟩

  • 6.3.1 Objects As Associative Arrays

  • 6.10.2 Computed Property Names

❓ 問題

❓ 問題： " What is a computed property name for❓"

💡 答案：

• for some special method names (e.g. make-iterator method name for an iterable)