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