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String(val) vs. val.toString() vs. val?.toString()
(version: 0)
Comparing performance of:
String(val) vs val.toString() vs val?.toString()
Created:
2 years ago
by:
Guest
Go to the latest result
Tests:
String(val)
let num = 500; let nums = []; for(let i = 0; i < 100; ++i) { nums.push(String(num)); }
val.toString()
let num = 500; let nums = []; for(let i = 0; i < 100; ++i) { nums.push(num.toString()); }
val?.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 (3)
Previous results
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Test case name
Result
String(val)
val.toString()
val?.toString()
Fastest:
N/A
Slowest:
N/A
Latest run results:
Run details:
(Test run date:
2 years ago
)
User agent:
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/127.0.0.0 Safari/537.36
Browser/OS:
Chrome 127 on Mac OS X 10.15.7
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Embed Benchmark Result
<iframe src="https://measurethat.net/Embed?id=536052" width="100%" height="500px"></iframe>
val.toString()
2.0M/s
val?.toString()
1.3M/s
String(val)
182K/s
View exact numbers
Test name
Executions per second
✓
val.toString()
1,965,290 Ops/sec
val?.toString()
1,299,561 Ops/sec
String(val)
182,273 Ops/sec
Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
Let's dive into the world of JavaScript microbenchmarks! **Overview** MeasureThat.net is a website where users can create and run JavaScript microbenchmarks to compare different approaches for various tasks. In this case, we have three individual test cases: "String(val)", "val.toString()", and "val?.toString()". We'll analyze each test case, explore the pros and cons of different approaches, and discuss any libraries or special features used. **Test Case 1: String(val)** In this test case, we're creating an array `nums` and pushing the string representation of a number (`500`) to it, repeated 100 times. The benchmarking code is: ```javascript let num = 500; let nums = []; for (let i = 0; i < 100; ++i) { nums.push(String(num)); } ``` **Approaches** There are three approaches being compared: 1. **String(val)**: This approach uses the `String()` function to convert the number to a string. 2. **val.toString()**: This approach uses the `toString()` method of the number object. 3. **val?.toString()**: This approach uses the optional chaining operator (`?.`) followed by the `toString()` method. **Pros and Cons** * **String(val)**: Pros: simple and easy to read. Cons: may be slower due to the overhead of creating a new string object. * **val.toString()**: Pros: more efficient than `String(val)` since it doesn't create a new string object. Cons: requires knowledge of number objects' methods. * **val?.toString()**: Pros: similar efficiency to `val.toString()` but with optional chaining, which can be beneficial for null or undefined values. Cons: may be slower due to the overhead of optional chaining. **Library/Library Purpose** There is no explicit library mentioned in this test case. However, it's worth noting that both `String(val)` and `val.toString()` rely on the built-in JavaScript `Number` object and its methods. **Special Feature/Syntax** None mentioned explicitly. **Alternatives** If you're interested in exploring alternative approaches or languages for microbenchmarking, here are some alternatives: * **Bench.js**: A popular benchmarking framework for Node.js. * **Benchmark.js**: Similar to Bench.js but designed specifically for JavaScript. * **Google's Benchmark**: A high-performance benchmarking library developed by Google. **Conclusion** In conclusion, the `String(val)` test case compares three approaches for converting a number to a string: using the `String()` function, the `toString()` method of the number object, and optional chaining with `?.` followed by `toString()`. Each approach has its pros and cons, and understanding these can help you optimize your code for performance.
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