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x/ramda/pipeP.js

:ram: Practical functional Javascript
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import _arity from './internal/_arity';import _pipeP from './internal/_pipeP';import reduce from './reduce';import tail from './tail';

/** * Performs left-to-right composition of one or more Promise-returning * functions. The leftmost function may have any arity; the remaining functions * must be unary. * * @func * @memberOf R * @since v0.10.0 * @category Function * @sig ((a -> Promise b), (b -> Promise c), ..., (y -> Promise z)) -> (a -> Promise z) * @param {...Function} functions * @return {Function} * @see R.composeP * @deprecated since v0.26.0 * @example * * // followersForUser :: String -> Promise [User] * const followersForUser = R.pipeP(db.getUserById, db.getFollowers); */export default function pipeP() { if (arguments.length === 0) { throw new Error('pipeP requires at least one argument'); } return _arity( arguments[0].length, reduce(_pipeP, arguments[0], tail(arguments)) );}