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import _curry1 from './_curry1';import _isPlaceholder from './_isPlaceholder';

/** * Optimized internal two-arity curry function. * * @private * @category Function * @param {Function} fn The function to curry. * @return {Function} The curried function. */export default function _curry2(fn) {  return function f2(a, b) {    switch (arguments.length) {      case 0:        return f2;      case 1:        return _isPlaceholder(a)          ? f2          : _curry1(function(_b) { return fn(a, _b); });      default:        return _isPlaceholder(a) && _isPlaceholder(b)          ? f2          : _isPlaceholder(a)            ? _curry1(function(_a) { return fn(_a, b); })            : _isPlaceholder(b)              ? _curry1(function(_b) { return fn(a, _b); })              : fn(a, b);    }  };}