Finally, Webkit's Number does similarly to V8's and the other methods fall behind, but are all close to each other. Interesting! V8 shows some huge numbers, all of them approximately the same! Spidermonkey doesn't really shine, but we can see that the bitwise and multiplication tricks come first, and the ternary if second. The first benchmark converts the constant true:
Browsers are Chrome 102, Firefox 101 and Safari 15.5.
#Convert string to number python leetcode pro
Benchmarks are run on a Macbook Pro 16-inch machine, with the Apple M1 Pro 10-core CPU and 16GB of RAM. If there is no percentage, the method is either the fastest or the difference is negligible (<0.01%). The percentage after the result represents how slow this method is compared to the fastest, in the same browser. In the following tables, conversion methods will be grouped to their results accordingly. Each conversion method is ran 100000 times, measuring operations/millisecond. "Conversion" means converting false to 0 and true to 1 1. If statement (ternary used): bool ? 1 : 0.For the conversion, we're using the following seven conversion methods:
Now, how do these 2 factors affect the performance of, well, boolean to integer conversion? Let's find out! Before we get into the benchmarks, it is important to know what we benchmark. This means that, besides branch prediction, the compiler can even substitute expressions with their final value. Also, nowadays, JS engines don't simply interpret the code, they JIT compile it to native machine code and optimize it prior to execution. Something I've noticed is that all benchmarks here are irrelevant - none take into account branch prediction. This is quite an old question, and there exist many valid answers. TL DR: Avoid Number constructor and +bool use a simple if by default resort to bool | 0, 1 * bool if benchmarks in your project do better this way.
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