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47 lines
1.7 KiB
TypeScript
47 lines
1.7 KiB
TypeScript
/*
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Copyright 2020 The Matrix.org Foundation C.I.C.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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/**
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* Determines if two arrays are different through a shallow comparison.
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* @param a The first array. Must be defined.
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* @param b The second array. Must be defined.
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* @returns True if they are the same, false otherwise.
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*/
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export function arrayHasDiff(a: any[], b: any[]): boolean {
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if (a.length === b.length) {
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// When the lengths are equal, check to see if either array is missing
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// an element from the other.
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if (b.some(i => !a.includes(i))) return true;
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if (a.some(i => !b.includes(i))) return true;
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} else {
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return true; // different lengths means they are naturally diverged
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}
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}
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/**
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* Performs a diff on two arrays. The result is what is different with the
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* first array (`added` in the returned object means objects in B that aren't
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* in A). Shallow comparisons are used to perform the diff.
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* @param a The first array. Must be defined.
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* @param b The second array. Must be defined.
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* @returns The diff between the arrays.
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*/
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export function arrayDiff<T>(a: T[], b: T[]): { added: T[], removed: T[] } {
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return {
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added: b.filter(i => !a.includes(i)),
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removed: a.filter(i => !b.includes(i)),
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};
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}
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