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array indexOf vs if/or
(version: 0)
performance comparison of ways to check for specific values
Comparing performance of:
IndexOf vs or vs IndexOf with reused array
Created:
4 years ago
by:
Guest
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HTML Preparation code:
<script src='https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.5/lodash.min.js'></script>
Script Preparation code:
var values = ['banana', 'sausage', 'jesus'] var value = 'sausage'
Tests:
IndexOf
['banana', 'sausage', 'jesus'].indexOf(value) !== -1
or
value === 'banana' || value === 'sausage' || value === 'jesus'
IndexOf with reused array
values.indexOf(value) !== 1
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (3)
Previous results
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Test case name
Result
IndexOf
or
IndexOf with reused array
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 its test cases. **Benchmark Purpose** The benchmark measures the performance of two approaches to check for specific values in an array: `indexOf` (method) and `or` (logical expression). **Test Cases** ### 1. "IndexOf" * **Benchmark Definition**: `['banana', 'sausage', 'jesus'].indexOf(value) !== -1` * Purpose: Compare the performance of using `indexOf` method to check if a value exists in an array. * Library Used: Built-in JavaScript `Array.prototype.indexOf()`. * Pros: + Easy to read and write, as it's a standard method. + Can be used with arrays of any type. * Cons: + May perform a linear search on large arrays, resulting in slower performance. + Does not provide any information about the index value if found. ### 2. "or" * **Benchmark Definition**: `value === 'banana' || value === 'sausage' || value === 'jesus'` * Purpose: Compare the performance of using a logical expression with multiple OR conditions to check if a value exists in an array. * Library Used: None (standard JavaScript syntax). * Pros: + Can be more efficient than `indexOf` for small arrays or specific use cases. + Easy to read and write, as it's a standard JavaScript syntax. * Cons: + May not perform well with large arrays due to the need to evaluate each condition. + Requires careful handling of multiple OR conditions. ### 3. "IndexOf with reused array" * **Benchmark Definition**: `values.indexOf(value) !== 1` * Purpose: Compare the performance of reusing an existing array when using `indexOf` method. * Library Used: Built-in JavaScript `Array.prototype.indexOf()`. * Pros: + Can be more efficient than creating a new array for each test case. + Reuses the same array object, which may reduce memory allocation overhead. * Cons: + May not provide meaningful results if the reuse factor is low or variable. **Special Considerations** None mentioned in this specific benchmark. **Alternatives** Other approaches to check for specific values in an array include: 1. **Using `includes()` method**: Introduced in ECMAScript 2019, `includes()` provides a more modern and efficient way to check if an element exists in an array. 2. **Using regular expressions**: Can be used to match patterns against arrays, but may not provide the same level of readability as other methods. 3. **Using a custom loop**: Implementing a custom loop to iterate through the array can be highly optimized for specific use cases, but is typically less readable and more error-prone. Keep in mind that these alternatives might require additional dependencies or modifications to the benchmark setup, which may affect the results.
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