restArguments.js

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- # restArguments.js

- ¶

  Some functions take a variable number of arguments, or a few expected arguments at the beginning and then a variable number of values to operate on. This helper accumulates all remaining arguments past the function’s argument length (or an explicit `startIndex`), into an array that becomes the last argument. Similar to ES6’s “rest parameter”.

      export default function restArguments(func, startIndex) {
        startIndex = startIndex == null ? func.length - 1 : +startIndex;
        return function() {
          var length = Math.max(arguments.length - startIndex, 0),
              rest = Array(length),
              index = 0;
          for (; index < length; index++) {
            rest[index] = arguments[index + startIndex];
          }
          switch (startIndex) {
            case 0: return func.call(this, rest);
            case 1: return func.call(this, arguments[0], rest);
            case 2: return func.call(this, arguments[0], arguments[1], rest);
          }
          var args = Array(startIndex + 1);
          for (index = 0; index < startIndex; index++) {
            args[index] = arguments[index];
          }
          args[startIndex] = rest;
          return func.apply(this, args);
        };
      }