JS Benchmarks

One day I was bored and tried to look up what is the most effective way to test if a string starts with. For my surprise I didn't find a central place for Node.js (or just JS) performance, so I created one.

Enjoy!

Table of Content

• Summery
• How to run
• Create Regex
• String Starts With
• Read File
• Math
  • Power
• Credits
• Hardware
• Contributes
• License

Summery

Category	Winner	ops/sec
Create Regex	Hard coded regex	811,885,533
String Starts With	String#substring	835,000,457
Read File	fs#readFileSync,fs#readFile	1.61
Math - Power	Power by **	824,394,518

How to Run

You can easily run the code yourself by choosing the benchmark from the CLI menu. To run the CLI menu just type:

$ npm run

Create Regex

What is the most effective way to create regex? Hard coded!

Output

RegExp#new x 9,653,554 ops/sec ±1.60% (85 runs sampled)
hard coded RegExp x 811,885,533 ops/sec ±1.65% (84 runs sampled)
Fastest is hard coded RegExp

String Starts With

What is the most effective way to find if a string starts with another string? substring!

String#indexOf x 803,084,164 ops/sec ±1.31% (87 runs sampled)
String#lastIndexOf x 17,167,310 ops/sec ±0.92% (87 runs sampled)
String#substring x 835,000,457 ops/sec ±1.24% (88 runs sampled)
String#slice x 818,594,603 ops/sec ±1.03% (86 runs sampled)
RegExp#tests x 18,745,095 ops/sec ±0.79% (84 runs sampled)
RegExp#tests (compiled) x 23,899,970 ops/sec ±1.17% (87 runs sampled)
String#startsWith x 29,204,473 ops/sec ±1.10% (87 runs sampled)
Fastest is String#substring

Read File

What is the most effective way to read a file? fs#readFileSync OR fs#readFile!

Output

fs#readFileSync x 1.61 ops/sec ±2.68% (9 runs sampled)
fs#readFile x 1.60 ops/sec ±2.56% (12 runs sampled)
readline x 0.18 ops/sec ±4.85% (5 runs sampled)
Fastest is fs#readFileSync,fs#readFile

Math

Power

What is the most effective way to read a file? Power by **!

Output

Math#pow x 806,111,918 ops/sec ±1.31% (85 runs sampled)
Power by ** x 824,394,518 ops/sec ±0.94% (87 runs sampled)
Fastest is Power by **

Credits

Most (if not all) the startsWith benchmark was originally written by @dai-shi

Hardware

Type	Value
Node.js	v14.4.0
OS	macOS 10.14.6
CPU	Intel i7 (Clock speed: 2.2 GHz)
RAM	16 GB DDR4 2400 MHz

Contributes

PR and suggestions are more the welcome!

If you have a new benchmark or new test that I overlooked open an Issue and PR with the changes

License

MIT License, read more here.