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Find diff two array
(version: 0)
Comparing performance of:
indexOf vs includes vs Set objec
Created:
4 years ago
by:
Guest
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Tests:
indexOf
var first = [ 1, 2, 3, 4, 5 ]; var second = [ 4, 5, 6 ]; var difference = first.filter(x => second.indexOf(x) === -1); console.log(difference);
includes
var first = [ 1, 2, 3, 4, 5 ]; var second = [ 4, 5, 6 ]; var difference = first.filter(x => !second.includes(x)); console.log(difference); /* Output: [ 1, 2, 3] */
Set objec
var first = [ 1, 2, 3, 4, 5 ]; var second = [ 4, 5, 6 ]; var b = new Set(second); var difference = [...first].filter(x => !b.has(x)); console.log(difference);
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (3)
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Test case name
Result
indexOf
includes
Set objec
Fastest:
N/A
Slowest:
N/A
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Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
I'll break down the explanation into manageable parts. **Benchmark Definition JSON** The provided JSON represents a benchmark definition for measuring JavaScript performance. It contains three optional fields: * `Name`: A descriptive name for the benchmark. * `Description`: A brief description of the benchmark (empty in this case). * `Script Preparation Code` and `Html Preparation Code`: Optional code to be executed before running the benchmark. Since these fields are empty, no preparation code is being executed before running the benchmarks. The focus is on measuring the performance of the JavaScript microbenchmarks defined in the individual test cases. **Individual Test Cases** There are three test cases: 1. `indexOf` 2. `includes` 3. `Set object` Each test case has a `Benchmark Definition` JSON that defines the code to be executed during the benchmark. **Options Compared** In each test case, two different approaches are compared: * Approach 1: Using `indexOf` method * Approach 2: Using `includes` method **Pros and Cons of Each Approach** Here's a brief analysis of each approach: **Approach 1: `indexOf` Method** Pros: * Widely supported across browsers * Simple to implement Cons: * Slow performance, especially for large arrays * May cause unnecessary DOM searches (in the case of Chrome) **Approach 2: `includes` Method** Pros: * Faster performance compared to `indexOf` * More modern and efficient implementation Cons: * May not be supported in older browsers or versions * Requires modern JavaScript features (ES6+) **Set Object Approach (`Set object`)** This approach uses a `Set` object to store unique elements from the second array. The filter function then checks if each element from the first array is present in the `Set`. This approach: Pros: * Fast performance, especially for large arrays * Efficient implementation using `Set` data structure Cons: * Requires modern JavaScript features (ES6+) * May not be supported in older browsers or versions **Library: `includes` method** The `includes` method is a built-in method in modern JavaScript (ES6+) that checks if an element is present in an array. It's implemented using the `Array.prototype.includes()` function. **Special JS Feature/Syntax** * `Set object`: Uses a `Set` data structure to store unique elements. * Modern JavaScript features (ES6+): Requires support for `includes`, `Set`, and other modern syntaxes, such as template literals (`\r\n`) and arrow functions (`=>`). **Other Alternatives** If the `includes` method is not supported or desired, alternative approaches can be used: * Using a manual loop to iterate through the second array * Using a third-party library that provides similar functionality * Employing other optimized algorithms, such as bitwise operations or caching Keep in mind that these alternatives might have different performance characteristics and may require additional code or configuration.
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