ramda/src/internal/_curryN.js

A practical functional library for JavaScript programmers.

var _arity = /*#__PURE__*/require("./_arity.js");
var _isPlaceholder = /*#__PURE__*/require("./_isPlaceholder.js");
/**
 * Internal curryN function.
 *
 * @private
 * @category Function
 * @param {Number} length The arity of the curried function.
 * @param {Array} received An array of arguments received thus far.
 * @param {Function} fn The function to curry.
 * @return {Function} The curried function.
 */
function _curryN(length, received, fn) {
  return function () {
    var combined = [];
    var argsIdx = 0;
    var left = length;
    var combinedIdx = 0;
    var hasPlaceholder = false;
    while (combinedIdx < received.length || argsIdx < arguments.length) {
      var result;
      if (combinedIdx < received.length && (!_isPlaceholder(received[combinedIdx]) || argsIdx >= arguments.length)) {
        result = received[combinedIdx];
      } else {
        result = arguments[argsIdx];
        argsIdx += 1;
      }
      combined[combinedIdx] = result;
      if (!_isPlaceholder(result)) {
        left -= 1;
      } else {
        hasPlaceholder = true;
      }
      combinedIdx += 1;
    }
    return !hasPlaceholder && left <= 0 ? fn.apply(this, combined) : _arity(Math.max(0, left), _curryN(length, combined, fn));
  };
}
module.exports = _curryN;