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String() vs .toString() 123
(version: 0)
Comparing performance of:
String() vs .toString()
Created:
4 years ago
by:
Guest
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Tests:
String()
let nums = []; for(let i = 0; i < 100; ++i) { nums.push(String(i)); }
.toString()
let nums = []; for(let i = 0; i < 100; ++i) { nums.push(i.toString()); }
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Suite status:
<idle, ready to run>
Run tests (2)
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Test case name
Result
String()
.toString()
Fastest:
N/A
Slowest:
N/A
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Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
Let's break down the provided benchmark and explain what's being tested. **What is being tested?** The benchmark compares two approaches for converting an integer to a string: using the `String()` function and using the `.toString()` method. In the test cases, we see two identical scripts that create an array `nums` and push either the result of `String(i)` or `i.toString()` onto it, 100 times. The script then measures how many executions per second are possible for each approach. **Options compared:** * Using the `String()` function to convert integers to strings * Using the `.toString()` method on integers **Pros and cons of each approach:** * **Using `String()`**: This is a more explicit way of converting an integer to a string, as it creates a new object in memory. It's also slower due to the overhead of creating an object. * **Using `.toString()`:** This method is built-in and doesn't create a new object, making it faster. However, it may not be as readable or explicit as using `String()`. In general, `String()` is considered more modern and explicit, but `.toString()` is often preferred for its speed advantages. The benchmark shows that in this case, `.toString()` is about 10 times faster than `String()`, likely due to the overhead of creating an object with `String()`. **Library:** There is no external library being used in these test cases. The tests are pure JavaScript and rely on built-in methods and functions. **Special JS feature or syntax:** None mentioned, but it's worth noting that some browsers may have specific optimizations or behaviors for certain JavaScript features or syntax. **Other alternatives:** If you wanted to compare different approaches for converting integers to strings, you could also consider using: * `Number()` + `''`: This concatenates a string literal with the result of `Number()`, which can be slower than `.toString()`. * `BigInt()`: If you're working with BigInt literals, this approach would be more suitable. However, it's not relevant to this specific benchmark. Overall, the benchmark provides a clear comparison between two common approaches for converting integers to strings in JavaScript, allowing users to see the performance differences between them.
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