let nums = [];for(let i = 0; i < 100; ++i) { nums.push(String(i));}let nums = [];for(let i = 0; i < 100; ++i) { nums.push(i.toString());}--enable-precise-memory-info flag.
| Test case name | Result |
|---|---|
| String() | |
| .toString() |
| Test name | Executions per second |
|---|---|
| String() | 39776.3 Ops/sec |
| .toString() | 414483.4 Ops/sec |
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:
String() function to convert integers to strings.toString() method on integersPros and cons of each approach:
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..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.
