🔰composition

JS ⟩ objects ⟩ built-in ⟩ Generator ⟩ generator function ⟩ compostion

✨ 範例

• *zip() - zip iterables into a single generator function.

• *interleave() - interleave the values of iterables.

• *sequence() - yield values sequentially.

💈範例

syntax：yield* <generator object>

⬆️ 需要： *list()

// ⭐️ composition of generator functions
function* alphaNumericCodes(){
    yield* list(26, {start: 97});   // a..z    // ⭐️ Note: use of `yield*`
    yield* list(26, {start: 65});   // A..Z
    yield* list(10, {start: 48});   // 0..9
}

// generator object -> array
[...alphaNumericCodes()]                 
    .map(n => String.fromCharCode(n))    // array of codes -> array of characters
    .join('')                            // 'a..zA..Z0..9'

📘 手冊