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(version: 0)
Comparing performance of:
entries vs spread map vs spread loop vs spread foreach
Created:
4 years ago
by:
Guest
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Tests:
entries
const n = 730; const m = new Map([...Array(730)].map((_, i) => ['k' + i, i])); const r = []; for (const [key, value] of m) { r.push(key + value); }
spread map
const n = 730; const m = new Map([...Array(730)].map((_, i) => ['k' + i, i])); const r = [...m].map(([key, value]) => key + value);
spread loop
const n = 730; const m = new Map([...Array(730)].map((_, i) => ['k' + i, i])); const a = [...m]; const r = new Array(a.length); for (let i = 0, len = r.length; i < len; ++i) { r[i] = a[i][0] + a[i][1]; }
spread foreach
const n = 730; const m = new Map([...Array(730)].map((_, i) => ['k' + i, i])); const a = [...m]; const r = new Array(a.length); let i = 0; m.forEach((v, k ) => { r[i] = k + v; ++i; });
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
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Test case name
Result
entries
spread map
spread loop
spread foreach
Fastest:
N/A
Slowest:
N/A
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Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
I'll explain the test cases and options compared in the provided benchmark. The test cases are designed to measure the performance of JavaScript's Map data structure, specifically its iteration methods: `entries`, `map()`, `spread map` (using array spread), `spread loop` (using a traditional for loop), and `spread foreach` (using the `forEach()` method). **Option Comparison:** 1. **`entries` vs. `map()`**: These two methods are equivalent, but they have different performance characteristics. * `entries` returns an iterator that yields arrays containing the key-value pairs of the Map. This approach requires more iterations and can be slower for large Maps. * `map()` applies a callback function to each element in the Map and returns a new array with the results. This approach is generally faster than `entries`, as it avoids unnecessary iterations. 2. **`spread map` vs. `map()`**: Both methods achieve the same result, but they have different performance implications: * `spread map` uses array spread to create a new array from the Map's entries. This approach can be slower than using `map()`, as it requires creating a new array. * `map()` directly applies a callback function to each element in the Map and returns a new array with the results. This approach is generally faster, as it avoids unnecessary array creation. 3. **`spread loop` vs. `forEach()`**: These two methods are equivalent, but they have different performance implications: * `spread loop` uses a traditional for loop to iterate over the Map's entries and construct a new array. This approach can be slower than using `forEach()`, as it involves more overhead due to the loop. * `forEach()` applies a callback function to each element in the Map, which is generally faster, as it avoids unnecessary iterations. 4. **`spread foreach` vs. `forEach()`**: These two methods are equivalent, but they have different performance implications: * `spread foreach` uses `forEach()` on the entire Map, whereas `forEach()` typically applies a callback function to each element in an array or collection. This approach can be slower than using `forEach()`, as it involves more overhead due to the loop. * Using `forEach()` directly on the Map's entries is generally faster, as it avoids unnecessary iterations. **Library and Special Features:** None of the test cases rely on external libraries or special JavaScript features beyond the built-in `Map` data structure. The benchmark focuses solely on measuring the performance of `Map` iteration methods. **Other Alternatives:** Some alternative approaches to iterating over a Map might include: * Using `for...in` loop to iterate over the Map's entries * Using `Object.keys()` and array indexing to access the Map's entries * Using `Array.prototype.reduce()` or other aggregation methods to process the Map's entries However, these alternatives are not part of the benchmark, as they do not directly compare the performance of different iteration methods. In summary, the benchmark measures the performance of four different iteration methods for JavaScript's Map data structure: `entries`, `map()`, `spread map`, and `forEach()` (including `spread foreach` and traditional loop-based approaches). The results provide insight into which method is fastest for common use cases involving Maps.
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