Benchmark of number length testing

number_length.dart

import 'dart:math';
import 'dart:typed_data';

import 'package:benchmark_harness/benchmark_harness.dart';

const length = 1000000;
final inputs = Int64List(length);

class WithLog extends BenchmarkBase {
  WithLog() : super('log');

  final log10 = log(10);

  @override
  void run() {
    for (var i = 0; i < length; i++) {
      (log(inputs[i]) / log10).floor() + 1;
    }
  }
}

class WithToString extends BenchmarkBase {
  WithToString() : super('toString');

  @override
  void run() {
    for (var i = 0; i < length; i++) {
      inputs[i].toString().length;
    }
  }
}

void main() {
  final rng = Random();
  const maxForNextInt = 1 << 32;

  for (var i = 0; i < length; i++) {
    // << 31 so we're always positive
    inputs[i] = (rng.nextInt(maxForNextInt) << 31) | rng.nextInt(maxForNextInt);
  }

  WithLog().report();
  WithToString().report();
}