Question

我收到以下错误：

node.js:201
    throw e; // process.nextTick error, or 'error' event on first tick
          ^
TypeError: undefined is not a function
    at /home/ubuntu/nodejs/test.js:4:10
    at factorial (/home/ubuntu/nodejs/test.js:17:20)
    at Object.<anonymous> (/home/ubuntu/nodejs/test.js:26:1)
    at Module._compile (module.js:441:26)
    at Object..js (module.js:459:10)
    at Module.load (module.js:348:32)
    at Function._load (module.js:308:12)
    at Array.0 (module.js:479:10)
    at EventEmitter._tickCallback (node.js:192:41)

当我运行此代码时：

var variadic = require('allong.es').variadic;

var trampoline = function (fn) {
  return variadic( function (args) {
    var result = fn.apply(this, args);

    while (result instanceof Function) {
      result = result();
    }

    return result;

  });
};

function factorial (n) {
  var _factorial = trampoline( function myself (acc, n) {
    return n
    ? function () { return myself(acc * n, n - 1); }
    : acc
  });

  return _factorial(1, n);
}

factorial(10);
  //=> 362800
factorial(32768);
  //=> Infinity

我是nodejs的新手。我使用apt-get安装了nodejs和npm，并使用npm install allong.es安装了allong.es。

我该怎么做才能让它发挥作用？

Answer 1

variadic功能不是“直接”导出，而是allong.es的一部分：

var variadic = require('allong.es').allong.es.variadic;

虽然这似乎也有效：

var variadic = require('allong.es').es.variadic;

找不到allong.es可变参数函数

1 个答案: