uncurryN.js•1.11 kB
var _curry2 = require('./internal/_curry2');
var _slice = require('./internal/_slice');
var curryN = require('./curryN');
/**
* Returns a function of arity `n` from a (manually) curried function.
*
* @func
* @memberOf R
* @since v0.14.0
* @category Function
* @sig Number -> (a -> b) -> (a -> c)
* @param {Number} length The arity for the returned function.
* @param {Function} fn The function to uncurry.
* @return {Function} A new function.
* @see R.curry
* @example
*
* var addFour = a => b => c => d => a + b + c + d;
*
* var uncurriedAddFour = R.uncurryN(4, addFour);
* uncurriedAddFour(1, 2, 3, 4); //=> 10
*/
module.exports = _curry2(function uncurryN(depth, fn) {
return curryN(depth, function() {
var currentDepth = 1;
var value = fn;
var idx = 0;
var endIdx;
while (currentDepth <= depth && typeof value === 'function') {
endIdx = currentDepth === depth ? arguments.length : idx + value.length;
value = value.apply(this, _slice(arguments, idx, endIdx));
currentDepth += 1;
idx = endIdx;
}
return value;
});
});