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https://github.com/facebook/react.git
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41 lines
1.2 KiB
JavaScript
41 lines
1.2 KiB
JavaScript
/**
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* Copyright (c) Facebook, Inc. and its affiliates.
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*
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* This source code is licensed under the MIT license found in the
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* LICENSE file in the root directory of this source tree.
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*
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* @flow
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*/
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import warning from 'shared/warning';
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export default function areHookInputsEqual(arr1: any[], arr2: any[]) {
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// Don't bother comparing lengths in prod because these arrays should be
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// passed inline.
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if (__DEV__) {
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warning(
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arr1.length === arr2.length,
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'Detected a variable number of hook dependencies. The length of the ' +
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'dependencies array should be constant between renders.\n\n' +
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'Previous: %s\n' +
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'Incoming: %s',
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arr1.join(', '),
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arr2.join(', '),
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);
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}
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for (let i = 0; i < arr1.length; i++) {
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// Inlined Object.is polyfill.
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// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/is
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const val1 = arr1[i];
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const val2 = arr2[i];
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if (
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(val1 === val2 && (val1 !== 0 || 1 / val1 === 1 / (val2: any))) ||
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(val1 !== val1 && val2 !== val2) // eslint-disable-line no-self-compare
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) {
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continue;
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}
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return false;
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}
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return true;
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}
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