ts-data-forge/dist/functional/optional/impl/optional-filter.mjs

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import { isSome } from './optional-is-some.mjs';
import { none } from './optional-none.mjs';
import { some } from './optional-some.mjs';
import { unwrap } from './optional-unwrap.mjs';

function filter(...args) {
    switch (args.length) {
        case 2: {
            const [optional, predicate] = args;
            return filterImpl(optional, predicate);
        }
        case 1: {
            // Curried version: first argument is predicate function
            const [predicate] = args;
            return (optional) => filterImpl(optional, predicate);
        }
    }
}
const filterImpl = (optional, predicate) => {
    if (isSome(optional)) {
        const value = unwrap(optional);
        return predicate(value) ? some(value) : none;
    }
    return none;
};

export { filter };
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