1 var apply = require('./_apply'),
2 createCtorWrapper = require('./_createCtorWrapper'),
3 root = require('./_root');
5 /** Used to compose bitmasks for wrapper metadata. */
9 * Creates a function that wraps `func` to invoke it with the optional `this`
10 * binding of `thisArg` and the `partials` prepended to those provided to
14 * @param {Function} func The function to wrap.
15 * @param {number} bitmask The bitmask of wrapper flags. See `createWrapper` for more details.
16 * @param {*} thisArg The `this` binding of `func`.
17 * @param {Array} partials The arguments to prepend to those provided to the new function.
18 * @returns {Function} Returns the new wrapped function.
20 function createPartialWrapper(func, bitmask, thisArg, partials) {
21 var isBind = bitmask & BIND_FLAG,
22 Ctor = createCtorWrapper(func);
26 argsLength = arguments.length,
28 leftLength = partials.length,
29 args = Array(leftLength + argsLength),
30 fn = (this && this !== root && this instanceof wrapper) ? Ctor : func;
32 while (++leftIndex < leftLength) {
33 args[leftIndex] = partials[leftIndex];
35 while (argsLength--) {
36 args[leftIndex++] = arguments[++argsIndex];
38 return apply(fn, isBind ? thisArg : this, args);
43 module.exports = createPartialWrapper;