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for loop vs every
(version: 0)
iterating over an array to test whether every element satisfies a condition the for loop uses "inlining" (the condition is right there, without an extra function call) the call to every uses the predefined lambda ("cond")
Comparing performance of:
for loop vs every
Created:
6 years ago
by:
Guest
Go to the latest result
Script Preparation code:
nums = [1,2,3,4,5,6,7,8,9,10,3,51,124,23,235,-124,25,253,256,315] cond = x => x >= 0;
Tests:
for loop
let result = true; for (let i = 0; i < nums.length; i++) { if (!(nums[i] >= 0)) { result = false; break; } }
every
nums.every(cond);
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
Previous results
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Test case name
Result
for loop
every
Fastest:
N/A
Slowest:
N/A
Latest run results:
Run details:
(Test run date:
5 months ago
)
User agent:
Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/142.0.0.0 Safari/537.36
Browser/OS:
Chrome 142 on Linux
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Embed Benchmark Result
<iframe src="https://measurethat.net/Embed?id=625727" width="100%" height="500px"></iframe>
every
57.0M/s
for loop
17.4M/s
View exact numbers
Test name
Executions per second
✓
every
57,015,796 Ops/sec
for loop
17,397,888 Ops/sec
Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
Let's dive into the benchmarking test and explain what's being tested. **What is being tested?** MeasureThat.net is testing two approaches to iterate over an array in JavaScript: traditional `for` loop and the `every()` method. The `for` loop uses a manual index (`i`) to access each element in the array, while the `every()` method takes a callback function (in this case, a simple lambda expression) that checks if all elements satisfy a condition. The `every()` method is designed to take advantage of JavaScript's optimization capabilities by reusing the same lambda function for all iterations. **Options compared** There are two main options being compared: 1. **For loop**: This traditional approach uses a manual index (`i`) to access each element in the array. 2. **Every() method**: This optimized approach uses a callback function (lambda expression) that checks if all elements satisfy a condition, allowing JavaScript to reuse this function for all iterations. **Pros and cons of each approach:** * **For loop**: + Pros: - Simple and well-known - Can be easily optimized by inlining the condition + Cons: - Requires manual index management - May not take advantage of JavaScript's optimization capabilities * **Every() method**: + Pros: - Optimized for performance, reusing the same lambda function for all iterations - Simple and concise syntax + Cons: - May have higher overhead due to the additional function call **Library usage** There is no explicit library used in this benchmark. However, it's worth noting that the `every()` method relies on JavaScript's built-in functionality. **Special JS feature or syntax** The `every()` method uses a special JavaScript syntax for callback functions (lambda expressions), which allows for concise and expressive code. This syntax is designed to be easy to read and understand. **Benchmark preparation code** The provided script preparation code sets up an array (`nums`) with 15 elements, including one out-of-range value (51). The lambda expression (`cond`) checks if each element is greater than or equal to 0. The `for` loop iterates over the array using a manual index, while the `every()` method uses its optimized approach. **Alternative approaches** Other alternatives for iterating over an array in JavaScript include: * **Map() and callback**: While not directly applicable here, using `map()` with a callback function can be a viable alternative. However, it would require additional processing to filter out elements that don't meet the condition. * **Reduce() and accumulator**: Similar to `map()`, `reduce()` could be used, but again, it would require additional processing. * **Custom implementation using index management**: An alternative approach would be to use a custom implementation that manages indices manually, similar to the traditional `for` loop. However, this would likely result in less optimized performance. Keep in mind that these alternatives might have different use cases or requirements, and the `every()` method is specifically designed for this type of iteration.
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