45 lines
1 KiB
JavaScript
45 lines
1 KiB
JavaScript
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// re-inventing the wheel:
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export function deepEqual(a, b) {
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if (a === b) return true; // <- shallow equality and primitives
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if (typeof a !== 'object' || typeof b !== 'object' || a === null || b === null) {
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return false;
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}
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if (Array.isArray(a) && Array.isArray(b)) {
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if (a.length !== b.length) return false;
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for (let i = 0; i < a.length; i++) {
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if (!deepEqual(a[i], b[i])) return false;
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}
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return true;
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}
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if (a instanceof Set) {
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if (!(b instanceof Set)) {
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return false;
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}
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if (a.size !== b.size) {
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return false;
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}
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for (const entry of a) {
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if (!b.has(entry)) {
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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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const keysA = Object.keys(a);
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const keysB = Object.keys(b);
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if (keysA.length !== keysB.length) return false;
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for (let key of keysA) {
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if (!keysB.includes(key) || !deepEqual(a[key], b[key])) {
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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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// zip two arrays
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export function zip(a, b) {
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return a.map((k, i) => [k, b[i]]);
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}
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