liftN.js•1.05 kB
var _curry2 = require('./internal/_curry2');
var _reduce = require('./internal/_reduce');
var _slice = require('./internal/_slice');
var ap = require('./ap');
var curryN = require('./curryN');
var map = require('./map');
/**
* "lifts" a function to be the specified arity, so that it may "map over" that
* many lists, Functions or other objects that satisfy the [FantasyLand Apply spec](https://github.com/fantasyland/fantasy-land#apply).
*
* @func
* @memberOf R
* @since v0.7.0
* @category Function
* @sig Number -> (*... -> *) -> ([*]... -> [*])
* @param {Function} fn The function to lift into higher context
* @return {Function} The lifted function.
* @see R.lift, R.ap
* @example
*
* var madd3 = R.liftN(3, R.curryN(3, (...args) => R.sum(args)));
* madd3([1,2,3], [1,2,3], [1]); //=> [3, 4, 5, 4, 5, 6, 5, 6, 7]
*/
module.exports = _curry2(function liftN(arity, fn) {
var lifted = curryN(arity, fn);
return curryN(arity, function() {
return _reduce(ap, map(lifted, arguments[0]), _slice(arguments, 1));
});
});