eris-keys
Version:
a JavaScript client library for eris-keys
32 lines (29 loc) • 941 B
JavaScript
var _arity = require('./internal/_arity');
var _pipeP = require('./internal/_pipeP');
var reduce = require('./reduce');
var tail = require('./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
* @example
*
* // followersForUser :: String -> Promise [User]
* var followersForUser = R.pipeP(db.getUserById, db.getFollowers);
*/
module.exports = 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)));
};