1 | 'use strict';
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2 |
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3 | var safeIsNaN = Number.isNaN ||
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4 | function ponyfill(value) {
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5 | return typeof value === 'number' && value !== value;
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6 | };
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7 | function isEqual(first, second) {
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8 | if (first === second) {
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9 | return true;
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10 | }
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11 | if (safeIsNaN(first) && safeIsNaN(second)) {
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12 | return true;
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13 | }
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14 | return false;
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15 | }
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16 | function areInputsEqual(newInputs, lastInputs) {
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17 | if (newInputs.length !== lastInputs.length) {
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18 | return false;
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19 | }
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20 | for (var i = 0; i < newInputs.length; i++) {
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21 | if (!isEqual(newInputs[i], lastInputs[i])) {
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22 | return false;
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23 | }
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24 | }
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25 | return true;
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26 | }
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27 |
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28 | function memoizeOne(resultFn, isEqual) {
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29 | if (isEqual === void 0) { isEqual = areInputsEqual; }
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30 | var lastThis;
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31 | var lastArgs = [];
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32 | var lastResult;
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33 | var calledOnce = false;
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34 | function memoized() {
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35 | var newArgs = [];
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36 | for (var _i = 0; _i < arguments.length; _i++) {
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37 | newArgs[_i] = arguments[_i];
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38 | }
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39 | if (calledOnce && lastThis === this && isEqual(newArgs, lastArgs)) {
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40 | return lastResult;
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41 | }
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42 | lastResult = resultFn.apply(this, newArgs);
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43 | calledOnce = true;
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44 | lastThis = this;
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45 | lastArgs = newArgs;
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46 | return lastResult;
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47 | }
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48 | return memoized;
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49 | }
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50 |
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51 | module.exports = memoizeOne;
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