29 lines
853 B
JavaScript
29 lines
853 B
JavaScript
var createCtor = require('./_createCtor'),
|
|
root = require('./_root');
|
|
|
|
/** Used to compose bitmasks for function metadata. */
|
|
var WRAP_BIND_FLAG = 1;
|
|
|
|
/**
|
|
* Creates a function that wraps `func` to invoke it with the optional `this`
|
|
* binding of `thisArg`.
|
|
*
|
|
* @private
|
|
* @param {Function} func The function to wrap.
|
|
* @param {number} bitmask The bitmask flags. See `createWrap` for more details.
|
|
* @param {*} [thisArg] The `this` binding of `func`.
|
|
* @returns {Function} Returns the new wrapped function.
|
|
*/
|
|
function createBind(func, bitmask, thisArg) {
|
|
var isBind = bitmask & WRAP_BIND_FLAG,
|
|
Ctor = createCtor(func);
|
|
|
|
function wrapper() {
|
|
var fn = (this && this !== root && this instanceof wrapper) ? Ctor : func;
|
|
return fn.apply(isBind ? thisArg : this, arguments);
|
|
}
|
|
return wrapper;
|
|
}
|
|
|
|
module.exports = createBind;
|