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Comparing performance of:
includes vs indexOf
Created:
3 years ago
by:
Guest
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Tests:
includes
const a = 'testText'; const arr = ['asdas', 'asdas2', 'asdas3', 'asdas4', 'asdas5', 'asdas6', 'asdas8', 'asdas12', 'asdas123', 'asdas25', 'asdas1512', 'asdas33', 'asdas44', 'asdas6666']; if (!arr.includes(a)) {}
indexOf
const a = 'testText'; const arr = ['asdas', 'asdas2', 'asdas3', 'asdas4', 'asdas5', 'asdas6', 'asdas8', 'asdas12', 'asdas123', 'asdas25', 'asdas1512', 'asdas33', 'asdas44', 'asdas6666']; if (arr.indexOf(a) === -1) {}
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
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Test case name
Result
includes
indexOf
Fastest:
N/A
Slowest:
N/A
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Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
**Benchmark Overview** MeasureThat.net is a website that allows users to create and run JavaScript microbenchmarks. The benchmark provided represents two test cases: `includes` and `indexOf`. These tests aim to measure the performance difference between using the `includes()` method versus the `indexOf()` method in JavaScript. **What's being tested?** In both test cases, a string (`a`) is defined as `'testText'`, and an array (`arr`) containing 13 elements is created. The tests then check if the string `a` is present in the array using either the `includes()` method or the `indexOf()` method. **Options being compared** The two options being compared are: 1. **`includes()`**: This method checks if a specified value (in this case, the string `a`) exists in an array. 2. **`indexOf()`**: This method returns the index of the first occurrence of a specified value (in this case, the string `a`) within an array. If the value is not found, it returns -1. **Pros and Cons** * **`includes()`** * Pros: * Simpler to use: It only requires a single method call. * Less prone to off-by-one errors (i.e., finding the wrong element). * Cons: * Generally slower than `indexOf()`, especially for large arrays, since it uses a linear search algorithm. * **`indexOf()`** * Pros: * Faster: It can take advantage of caching and better performance in modern browsers. * More accurate: Returns the correct index even when there are duplicate values in the array. * Cons: * Less intuitive: Requires calling multiple methods to get the result (i.e., `indexOf(a)` returns -1 if not found, but you need to check this value). * More error-prone due to potential off-by-one errors. **Library usage** In neither test case is a specific library used. However, it's worth noting that both methods are part of the ECMAScript standard and can be used in any JavaScript environment. **Special JS feature or syntax** There are no special JavaScript features or syntax used in these tests. **Other alternatives** If you need to measure performance differences between other array searching methods (e.g., `Array.prototype.includes()`, `Array.prototype.lastIndexOf()`), MeasureThat.net provides an option to create a custom benchmark with your own test case. Keep in mind that adding more complex scenarios might make the benchmark less representative of real-world usage. For those interested in learning how to prepare and run benchmarks using MeasureThat.net, here are some general tips: 1. Choose relevant metrics: Focus on measuring performance differences between different methods or approaches. 2. Use a simple test case: Keep your test cases short and concise to avoid unnecessary overhead. 3. Ensure representative data: Select input data that accurately represents real-world scenarios. 4. Run multiple executions: Measure the average execution time over multiple runs for more accurate results. By following these guidelines, you can create informative benchmarks like this example and gain insights into performance differences between various JavaScript methods.
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