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string concat vs .toString()
(version: 0)
Comparing performance of:
String() vs .toString()
Created:
one year ago
by:
Guest
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Tests:
String()
let num = 500; let nums = []; for(let i = 0; i < 100; ++i) { nums.push(num+''); }
.toString()
let num = 500; let nums = []; for(let i = 0; i < 100; ++i) { nums.push(num.toString()); }
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
Previous results
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Test case name
Result
String()
.toString()
Fastest:
N/A
Slowest:
N/A
Latest run results:
Run details:
(Test run date:
one year ago
)
User agent:
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/128.0.0.0 Safari/537.36
Browser/OS:
Chrome 128 on Mac OS X 10.15.7
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Embed Benchmark Result
<iframe src="https://measurethat.net/Embed?id=542066" width="100%" height="500px"></iframe>
String()
5.1M/s
.toString()
1.5M/s
View exact numbers
Test name
Executions per second
✓
String()
5,139,344 Ops/sec
.toString()
1,516,883 Ops/sec
Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
I'll break down the provided benchmark and explain what's being tested, compared, and analyzed. **Benchmark Overview** The provided JSON represents a JavaScript microbenchmark on MeasureThat.net. The benchmark compares two approaches to concatenate strings: using the `+` operator (string concatenation) versus calling the `.toString()` method. **Test Cases** There are two test cases: 1. **String()**: This test case uses string concatenation to build an array of 100 strings, each containing the number 500. 2. **.toString()**: This test case also builds an array of 100 strings, but it calls the `.toString()` method on the number 500 instead of using string concatenation. **Comparison** The benchmark compares the performance of these two approaches: * **String Concatenation (String())**: This approach uses the `+` operator to concatenate strings. For example: `num + ''`. * **.toString() Method (.toString())**: This approach calls the `.toString()` method on the number 500, which returns a string representation of the number: `500.toString()`. **Pros and Cons** Here's a brief analysis of each approach: * **String Concatenation (String())**: + Pros: Simple to implement and understand. + Cons: Can be slower due to the overhead of creating a new string object on each concatenation. * **.toString() Method (.toString())**: + Pros: Typically faster than string concatenation because it uses a pre-built method that optimizes string creation. + Cons: Requires calling an additional method, which can introduce overhead. **Library and Special Features** Neither test case uses any external libraries or special JavaScript features beyond the standard `String` type and basic syntax. The `.toString()` method is a built-in method on the `Number` type that returns a string representation of the number. **Other Alternatives** If you wanted to modify this benchmark, here are some alternative approaches you could consider: * Using a different concatenation approach, such as using an array's `push` method with a template literal (e.g., `[...nums, num]`) or using a library like Lodash's `repeat` function. * Adding additional test cases that compare other string manipulation techniques, such as using `slice()` or `substring()`. * Using different input values, such as larger numbers or strings, to see how the benchmark performs under varying conditions. I hope this explanation helps!
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