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Item equals one of many comparison vs includes
(version: 0)
Comparing performance of:
Comparison, target is last vs Comparist, target is first vs Array.includes
Created:
4 years ago
by:
Registered User
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Script Preparation code:
var str = "there";
Tests:
Comparison, target is last
const a = str === "hello" || str === "world" || str === "hey" || str === "there";
Comparist, target is first
const a = str === "there" || str === "hello" || str === "world" || str === "hey";
Array.includes
const a = ["hello", "world", "hey", "there"].includes(str);
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (3)
Previous results
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Test case name
Result
Comparison, target is last
Comparist, target is first
Array.includes
Fastest:
N/A
Slowest:
N/A
Latest run results:
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Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
Let's break down the provided benchmark and explain what's being tested. **Benchmark Overview** The benchmark measures performance differences between three approaches for comparing strings in JavaScript: 1. Direct string comparison (using `===`) 2. Using the `includes()` method on an array 3. Comparing two arrays using a custom logic (not explicitly shown, but inferred from the benchmark) **Direct String Comparison** This approach uses the triple equals operator (`===`) to compare the input string `str` with several predefined values: `"hello"`, `"world"`, `"hey"`, and `"there"`. The comparison is done sequentially, i.e., the code checks if `str` is equal to each of these values in order. If any of these conditions are true, the expression evaluates to `true`. Pros: * Simple and straightforward implementation * Easy to understand and maintain Cons: * May lead to slower performance due to sequential comparisons * Can be brittle if additional comparison values are added or removed **Using `includes()` Method** This approach uses the `includes()` method on an array containing the predefined values. The code checks if the input string `str` is included in this array. Pros: * More efficient than direct string comparison, as it only needs to iterate over the array once * Can be more concise and expressive Cons: * May require additional setup (e.g., creating an array of values) that's not shown in the benchmark * May not perform as well if the array is very large or contains many duplicates **Comparing Two Arrays** This approach is implied by the test case names, but not explicitly shown. It likely uses a custom logic to compare two arrays (one containing the predefined values and another containing the input string `str`). Pros: * Can be optimized for performance, especially if the array sizes are fixed * Can be more efficient than using `includes()` method Cons: * Requires additional setup and implementation effort * May be less straightforward to understand and maintain due to custom logic **Library Usage** In the test case "Array.includes", the `includes()` method is used on an array. This suggests that the benchmark is measuring the performance of this method in different browsers. The `includes()` method is a part of the ECMAScript standard, so it's widely supported across modern browsers. **Special JS Feature/Syntax** None are explicitly mentioned in the provided benchmark. However, it's worth noting that the use of triple equals operator (`===`) and array methods like `includes()` may require specific JavaScript versions or browser implementations to work correctly. **Alternatives** Other approaches for comparing strings in JavaScript might include: * Using regular expressions * Using a library like Lodash or Underscore.js for string manipulation * Implementing custom string comparison algorithms However, these alternatives are not explicitly shown in the benchmark and would likely require additional implementation effort to measure their performance.
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