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robinpokorny/promise-fallback.js

Created January 4, 2017 10:42
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Promise sequence fallback (first non-empty)
Raw
promise-fallback.js
export default (tasks, {
args = [],
initial,
isEmpty = (x) => !x
} = {}) =>
tasks.reduce(
(prev, next) => prev.then((value) =>
isEmpty(value) ? next(...args) : value
),
Promise.resolve(initial)
)
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