vui-design/src/utils/restArgs.js

A high quality UI Toolkit based on Vue.js

export default function(fn, startIndex) {
  startIndex = startIndex == null ? fn.length - 1 : +startIndex;

  return function() {
    let index = 0, length = Math.max(arguments.length - startIndex, 0), rest = Array(length);

    for (; index < length; index++) {
      rest[index] = arguments[index + startIndex];
    }

    switch (startIndex) {
      case 0:
        return fn.call(this, rest);
      case 1:
        return fn.call(this, arguments[0], rest);
      case 2:
        return fn.call(this, arguments[0], arguments[1], rest);
    }

    var args = Array(startIndex + 1);

    for (index = 0; i < startIndex; index++) {
      args[index] = arguments[index];
    }

    args[startIndex] = rest;

    return fn.apply(this, args);
  };
};