🔰make iterables

JS⟩ iteration ⟩ iterable ⟩ make iterables

⭐️ 重點

we can make class/object iterable by letting them：

• make iterator object directly ( 👉 see： ClosedRange)

• return new iterator using generator function ( 👉 see：��例一 )

📗 參考

• 2ality ⟩ iterable iterator

examples

💈例一

use generator function to return new iterator.

💾 replit：make class iterable

// an iterable (that can make iterators)
class ValueContainer {

    // private properties
    #values;

    // init
    constructor(...values) {
        this.#values = values;
    }

    // ⭐ "make iterator" method
    // ⭐ use generator function to return new iterator
    *[Symbol.iterator]() {
        for (const value of this.#values) {
            yield value;
        }
    }

}

// main
let container = new ValueContainer(1,2,3);
[...container];        // [ 1, 2, 3 ]

👥 相關

• private member