unwrapOptional

Optional 値をアンラップし、Some(value) を value に、None を undefined に変換します。

Marble Diagram

unwrapOptional()

使用例

//  Timeline:
//
//  opt$        Some(42)    None        Some(7)
//  unwrapped$  42          undefined   7
//
//  Explanation:
//  - unwrapOptional converts Some(value) to value, and None to undefined
//  - Useful for extracting raw values from Optional streams

const opt$ = source<Optional<number>>();

const unwrapped$ = opt$.pipe(unwrapOptional());

const valueHistory: (number | undefined)[] = [];

unwrapped$.subscribe((v) => {
    valueHistory.push(v);
});

opt$.next(Optional.some(42));

assert.deepStrictEqual(valueHistory, [42]);

opt$.next(Optional.none);

assert.deepStrictEqual(valueHistory, [42, undefined]);

opt$.next(Optional.some(7));

assert.deepStrictEqual(valueHistory, [42, undefined, 7]);

View source on GitHub