1 | /*
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2 | * Copyright 2018 Palantir Technologies, Inc. All rights reserved.
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3 | *
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4 | * Licensed under the Apache License, Version 2.0 (the "License");
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5 | * you may not use this file except in compliance with the License.
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6 | * You may obtain a copy of the License at
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7 | *
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8 | * http://www.apache.org/licenses/LICENSE-2.0
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9 | *
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10 | * Unless required by applicable law or agreed to in writing, software
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11 | * distributed under the License is distributed on an "AS IS" BASIS,
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12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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13 | * See the License for the specific language governing permissions and
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14 | * limitations under the License.
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15 | */
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16 | import { Utils } from "@blueprintjs/core";
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17 | /**
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18 | * Utility function for executing the {@link IListItemsProps#itemsEqual} prop to test
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19 | * for equality between two items.
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20 | *
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21 | * @return `true` if the two items are equivalent according to `itemsEqualProp`.
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22 | */
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23 | export function executeItemsEqual(itemsEqualProp, itemA, itemB) {
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24 | // Use strict equality if:
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25 | // A) Default equality check is necessary because itemsEqualProp is undefined.
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26 | // OR
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27 | // B) Either item is null/undefined. Note that null represents "no item", while
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28 | // undefined represents an uncontrolled prop. This strict equality check ensures
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29 | // nothing will ever be considered equivalent to an uncontrolled prop.
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30 | if (itemsEqualProp === undefined || itemA == null || itemB == null) {
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31 | return itemA === itemB;
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32 | }
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33 | if (Utils.isFunction(itemsEqualProp)) {
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34 | // itemsEqualProp is an equality comparator function, so use it
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35 | return itemsEqualProp(itemA, itemB);
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36 | }
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37 | else {
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38 | // itemsEqualProp is a property name, so strictly compare the values of the property.
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39 | return itemA[itemsEqualProp] === itemB[itemsEqualProp];
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40 | }
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41 | }
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42 | //# sourceMappingURL=listItemsProps.js.map |
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