42 lines
1.2 KiB
TypeScript
42 lines
1.2 KiB
TypeScript
// Number.isNaN as it is not supported in IE11 so conditionally using ponyfill
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// Using Number.isNaN where possible as it is ~10% faster
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const safeIsNaN =
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Number.isNaN ||
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function ponyfill(value: unknown): boolean {
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// // https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Number/isNaN#polyfill
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// NaN is the only value in JavaScript which is not equal to itself.
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return typeof value === 'number' && value !== value;
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};
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function isEqual(first: unknown, second: unknown): boolean {
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if (first === second) {
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return true;
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}
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// Special case for NaN (NaN !== NaN)
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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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export default function areInputsEqual(
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newInputs: readonly unknown[],
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lastInputs: readonly unknown[],
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): boolean {
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// no checks needed if the inputs length has changed
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if (newInputs.length !== lastInputs.length) {
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return false;
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}
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// Using for loop for speed. It generally performs better than array.every
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// https://github.com/alexreardon/memoize-one/pull/59
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for (let 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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