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42 lines
1.3 KiB
TypeScript
42 lines
1.3 KiB
TypeScript
// Loaded from https://deno.land/x/ramda@v0.27.2/source/otherwise.js
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import _curry2 from './internal/_curry2.js';
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import _assertPromise from './internal/_assertPromise.js';
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/**
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* Returns the result of applying the onFailure function to the value inside
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* a failed promise. This is useful for handling rejected promises
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* inside function compositions.
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*
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* @func
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* @memberOf R
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* @since v0.26.0
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* @category Function
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* @sig (e -> b) -> (Promise e a) -> (Promise e b)
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* @sig (e -> (Promise f b)) -> (Promise e a) -> (Promise f b)
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* @param {Function} onFailure The function to apply. Can return a value or a promise of a value.
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* @param {Promise} p
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* @return {Promise} The result of calling `p.then(null, onFailure)`
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* @see R.andThen
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* @example
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*
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* const failedFetch = id => Promise.reject('bad ID');
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* const useDefault = () => ({ firstName: 'Bob', lastName: 'Loblaw' });
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*
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* //recoverFromFailure :: String -> Promise ({ firstName, lastName })
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* const recoverFromFailure = R.pipe(
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* failedFetch,
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* R.otherwise(useDefault),
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* R.andThen(R.pick(['firstName', 'lastName'])),
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* );
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* recoverFromFailure(12345).then(console.log);
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*/
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var otherwise = _curry2(function otherwise(f, p) {
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_assertPromise('otherwise', p);
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return p.then(null, f);
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});
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export default otherwise;
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