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51 lines
1.3 KiB
51 lines
1.3 KiB
'use strict'; |
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var safeIsNaN = Number.isNaN || |
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function ponyfill(value) { |
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return typeof value === 'number' && value !== value; |
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}; |
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function isEqual(first, second) { |
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if (first === second) { |
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return true; |
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} |
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if (safeIsNaN(first) && safeIsNaN(second)) { |
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return true; |
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} |
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return false; |
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} |
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function areInputsEqual(newInputs, lastInputs) { |
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if (newInputs.length !== lastInputs.length) { |
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return false; |
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} |
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for (var i = 0; i < newInputs.length; i++) { |
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if (!isEqual(newInputs[i], lastInputs[i])) { |
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return false; |
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} |
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} |
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return true; |
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} |
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function memoizeOne(resultFn, isEqual) { |
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if (isEqual === void 0) { isEqual = areInputsEqual; } |
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var lastThis; |
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var lastArgs = []; |
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var lastResult; |
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var calledOnce = false; |
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function memoized() { |
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var newArgs = []; |
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for (var _i = 0; _i < arguments.length; _i++) { |
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newArgs[_i] = arguments[_i]; |
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} |
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if (calledOnce && lastThis === this && isEqual(newArgs, lastArgs)) { |
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return lastResult; |
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} |
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lastResult = resultFn.apply(this, newArgs); |
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calledOnce = true; |
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lastThis = this; |
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lastArgs = newArgs; |
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return lastResult; |
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} |
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return memoized; |
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} |
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module.exports = memoizeOne;
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