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Number array indexOf vs includes vs some vs find vs for vs in
(version: 0)
performance comparison of ways to find if an array contains a value
Comparing performance of:
IndexOf vs Includes vs some vs find vs for loop vs in
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 array = [1, 2, 3]
Tests:
IndexOf
array.indexOf(3) !== 1
Includes
array.includes(3)
some
array.some(v => v == 3)
find
array.find(v => v == 3)
for loop
for (let i = 0; i < array.length; i++) { if (array[i] == 3) { return true; } }
in
3 in array
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (6)
Previous results
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Test case name
Result
IndexOf
Includes
some
find
for loop
in
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 dive into the explanation of the benchmark and its test cases. **What is being tested?** MeasureThat.net is testing the performance of different ways to check if an array contains a specific value. The benchmark is comparing the execution time of six methods: 1. `array.indexOf(3) !== 1` 2. `array.includes(3)` 3. `array.some(v => v == 3)` 4. `array.find(v => v == 3)` 5. A manual `for` loop to check if an element exists in the array 6. The `in` operator to check if a value is present in the array **Options being compared** The benchmark is comparing the performance of these six methods: * `indexOf`: returns the index of the first occurrence of the specified value, or -1 if it's not found. * `includes`: checks if the array contains the specified value. * `some`: returns true if at least one element in the array matches the specified condition. * `find`: returns the first element that satisfies the specified condition, or undefined if no elements match. * Manual `for` loop: uses a traditional loop to iterate through the array and check for the presence of the value. * `in`: checks if the value is present in the array using the `in` operator. **Pros and Cons of each approach** Here's a brief summary of the pros and cons of each approach: * `indexOf`: Pros: concise, fast. Cons: returns index, not boolean result, can be slower for large arrays. * `includes`: Pros: easy to read, fast. Cons: can be slower for very small arrays due to overhead. * `some` and `find`: Pros: concise, flexible. Cons: may return false positives or negatives if the condition is too loose or strict. * Manual `for` loop: Pros: explicit control, no external dependencies. Cons: verbose, error-prone, slow. * `in`: Pros: simple, fast. Cons: can be slower for very small arrays due to overhead. **Library usage** The benchmark uses Lodash library, which provides the `some` and `find` functions. These functions are often used in functional programming to reduce code duplication and improve readability. **Special JS features or syntax** There's no special JavaScript feature or syntax being tested in this benchmark. All test cases use standard JavaScript syntax. **Alternatives** If you're interested in exploring alternative approaches, here are a few options: * Use `Array.prototype.every` instead of `some` for a more concise and expressive way to check if all elements match the condition. * Use `Array.prototype.reduce` instead of `find` for a more functional programming approach to find the first element that satisfies the condition. * Consider using a custom implementation for the manual `for` loop, such as using a `while` loop or a recursive function. Keep in mind that these alternatives might not be directly comparable to the original benchmark, as they may use different optimization strategies or trade-offs.
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