70 lines
1.8 KiB
JavaScript
70 lines
1.8 KiB
JavaScript
/**
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* Performance Test Template
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*
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* Benchmark functions to measure optimization impact.
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*/
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// Benchmark function
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function benchmark(fn, iterations = 1000) {
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const start = performance.now();
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for (let i = 0; i < iterations; i++) {
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fn();
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}
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const end = performance.now();
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const total = end - start;
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const avg = total / iterations;
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return {
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total: total.toFixed(2),
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average: avg.toFixed(4),
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iterations
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};
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}
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// Example: Before optimization
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function processItemsOld(items) {
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const result = [];
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for (let i = 0; i < items.length; i++) {
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for (let j = 0; j < items.length; j++) {
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if (items[i].id === items[j].relatedId) {
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result.push({ item: items[i], related: items[j] });
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}
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}
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}
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return result;
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}
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// Example: After optimization
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function processItemsNew(items) {
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const map = new Map(items.map(i => [i.id, i]));
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return items
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.filter(i => i.relatedId)
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.map(i => ({ item: i, related: map.get(i.relatedId) }));
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}
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// Test data
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const testItems = Array.from({ length: 1000 }, (_, i) => ({
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id: i,
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relatedId: Math.floor(Math.random() * 1000)
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}));
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// Run benchmarks
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console.log('Performance Benchmark Results\n');
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const oldResults = benchmark(() => processItemsOld(testItems), 100);
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console.log('Before Optimization:');
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console.log(` Total: ${oldResults.total}ms`);
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console.log(` Average: ${oldResults.average}ms`);
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console.log(` Iterations: ${oldResults.iterations}\n`);
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const newResults = benchmark(() => processItemsNew(testItems), 100);
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console.log('After Optimization:');
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console.log(` Total: ${newResults.total}ms`);
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console.log(` Average: ${newResults.average}ms`);
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console.log(` Iterations: ${newResults.iterations}\n`);
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const improvement = ((parseFloat(oldResults.total) / parseFloat(newResults.total))).toFixed(1);
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console.log(`Performance Gain: ${improvement}x faster`);
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