run ./run.sh NodeJs slice string test Str length:99900 Time: 4 Str length:1 real 0m0.059s user 0m0.056s sys 0m0.000s Dart slice (substring) string test Str length: 99900 Time: 1865 Str length: 1 real 0m1.930s user 0m1.920s sys 0m0.032s