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32 lines
1.0 KiB
32 lines
1.0 KiB
/** |
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* Copyright 2013-2015, Facebook, Inc. |
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* All rights reserved. |
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* |
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* This source code is licensed under the BSD-style license found in the |
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* LICENSE file in the root directory of this source tree. An additional grant |
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* of patent rights can be found in the PATENTS file in the same directory. |
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* |
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* @providesModule emptyFunction |
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*/ |
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function makeEmptyFunction(arg) { |
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return function() { |
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return arg; |
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}; |
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} |
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/** |
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* This function accepts and discards inputs; it has no side effects. This is |
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* primarily useful idiomatically for overridable function endpoints which |
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* always need to be callable, since JS lacks a null-call idiom ala Cocoa. |
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*/ |
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function emptyFunction() {} |
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emptyFunction.thatReturns = makeEmptyFunction; |
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emptyFunction.thatReturnsFalse = makeEmptyFunction(false); |
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emptyFunction.thatReturnsTrue = makeEmptyFunction(true); |
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emptyFunction.thatReturnsNull = makeEmptyFunction(null); |
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emptyFunction.thatReturnsThis = function() { return this; }; |
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emptyFunction.thatReturnsArgument = function(arg) { return arg; }; |
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module.exports = emptyFunction;
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