Quingsley

import 'package:flutter/material.dart';
import 'dart:math' as math;

void main() {
  runApp(MyApp());
}

class CurvePainter extends CustomPainter {
  @override
  void paint(Canvas canvas, Size size) {

Quingsley

import 'dart:async';
void main() {
  const monitor = 3000; // 3s
  
  Timer.periodic(Duration(seconds: monitor), (timer){
    print('Timer $timer');
    refreshTokenChk(monitor);
  });
}

Quingsley

import 'dart:math';

void main() {
  final isSame = same([1, 4, 5], [16,  1, 25]);
  print(isSame);
}

bool same(List<int> array1, List<int> array2) {
  if (array1.length != array2.length) {
    return false;

Quingsley

void main() {
  bool result = isAnagram('iceman', 'cinemas');
  print(result);

}

bool isAnagram(String first, String second) {
  if (first.length != second.length) {
    return false;
  }

Quingsley

void main() {
  final result = sumZero([-6, -5, 0, 1, 2, 3, 4]);
  print(result);
  print(uniqueCount([-2,-1,-1, 0,1]));
}

//assume it receives a sorted array
// return a pair of values whose sum is 0 otherwise undefined
//using multiple pointers pattern