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37 lines
1.4 KiB
37 lines
1.4 KiB
var baseCreate = require('./_baseCreate'), |
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isObject = require('./isObject'); |
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/** |
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* Creates a function that produces an instance of `Ctor` regardless of |
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* whether it was invoked as part of a `new` expression or by `call` or `apply`. |
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* |
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* @private |
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* @param {Function} Ctor The constructor to wrap. |
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* @returns {Function} Returns the new wrapped function. |
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*/ |
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function createCtor(Ctor) { |
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return function() { |
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// Use a `switch` statement to work with class constructors. See |
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// http://ecma-international.org/ecma-262/7.0/#sec-ecmascript-function-objects-call-thisargument-argumentslist |
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// for more details. |
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var args = arguments; |
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switch (args.length) { |
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case 0: return new Ctor; |
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case 1: return new Ctor(args[0]); |
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case 2: return new Ctor(args[0], args[1]); |
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case 3: return new Ctor(args[0], args[1], args[2]); |
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case 4: return new Ctor(args[0], args[1], args[2], args[3]); |
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case 5: return new Ctor(args[0], args[1], args[2], args[3], args[4]); |
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case 6: return new Ctor(args[0], args[1], args[2], args[3], args[4], args[5]); |
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case 7: return new Ctor(args[0], args[1], args[2], args[3], args[4], args[5], args[6]); |
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} |
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var thisBinding = baseCreate(Ctor.prototype), |
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result = Ctor.apply(thisBinding, args); |
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// Mimic the constructor's `return` behavior. |
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// See https://es5.github.io/#x13.2.2 for more details. |
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return isObject(result) ? result : thisBinding; |
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}; |
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} |
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module.exports = createCtor;
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