Function createPartialWrapper

lib/web/jshint.js:5105–5128

* Creates a function that wraps `func` and invokes it with the optional `this` * binding of `thisArg` and the `partials` prepended to those provided to * the wrapper. * * @private * @param {Function} func The function to partially apply arguments to. * @param {number} b

(func, bitmask, thisArg, partials)

     * @returns {Function} Returns the new bound function.
     */
    function createPartialWrapper(func, bitmask, thisArg, partials) {
      var isBind = bitmask & BIND_FLAG,
          Ctor = createCtorWrapper(func);

      function wrapper() {
        // Avoid `arguments` object use disqualifying optimizations by
        // converting it to an array before providing it `func`.
        var argsIndex = -1,
            argsLength = arguments.length,
            leftIndex = -1,
            leftLength = partials.length,
            args = Array(argsLength + leftLength);

        while (++leftIndex < leftLength) {
          args[leftIndex] = partials[leftIndex];
        }
        while (argsLength--) {
          args[leftIndex++] = arguments[++argsIndex];
        }
        var fn = (this && this !== root && this instanceof wrapper) ? Ctor : func;
        return fn.apply(isBind ? thisArg : this, args);
      }
      return wrapper;
    }

    /**
     * Creates a `_.sortedIndex` or `_.sortedLastIndex` function.