Mastersam07

void main(){
  var squares = 64;
  numberOfGrain(squares);
}

void numberOfGrain(int numberOfSquares){
  
  // To get the total sum of grians we use a sum of GP where n is number of squares
  // common ratio r is 2 (grains in square two / grains in square one)
  // Sum of GP = a*(r^n-1)/r-1 where r=2;n=64

Mastersam07

// Banks database containing all created accts both active and inactive
List<BankAccount> _bankDB = [];
BankAccount myBankAccount(String accountNumber){
  //function that checks if acct exists in DB else create new acct
  var hiddenAccNumber =  List.generate(accountNumber.length-4,(_)=>'*').join("")+accountNumber.substring(accountNumber.length-4);

  try{
  var x = _bankDB.firstWhere((b)=>b.accountNumber==accountNumber);
    print('Account $hiddenAccNumber active....');
    return x;

Mastersam07

void main() {
  print(append([1, 2], [3, 4, 5]));   // append
  print(concatenate([
    [1, 2, 3],
    [4, 5, 6] // concatenate
  ]));
  print(filter(isOdd, [1, 2, 3, 4, 5, 6, 7, 8, 9, 0]));  // filter
  print(length([1, 2, 3, 4, 5, 6, 7]));       // length
  print(map(cubeIt, [1, 2, 3, 4, 5, 6]));     // map
  print(reverse([0, 1, 2, 3, 4, 5]));       // reverse

Mastersam07

import 'package:flutter/material.dart';

void main() {
  runApp(
    MaterialApp(
      debugShowCheckedModeBanner: false, // removing the debug tag
      home: new Home(), // the app
    ),
  );
}

Mastersam07

import 'package:flutter/material.dart';

void main() => runApp(MyApp());

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'WhatsApp',
      debugShowCheckedModeBanner: false, // remove debug banner

Mastersam07

import 'package:flutter/material.dart';

void main() => runApp(MyApp());

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'WhatsApp',
      debugShowCheckedModeBanner: false,

Mastersam07

import 'package:flutter/material.dart';

void main() => runApp(MyApp());

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'WhatsApp',
      debugShowCheckedModeBanner: false,

Mastersam07

import 'package:flutter/material.dart';


void main() {
  runApp(new MaterialApp(
    home: new MyHomePage(), // runApp();
  ));
}

class MyHomePage extends StatefulWidget {

Mastersam07

/// EXC attendance form UI withoout onpressed method
/// and validation

import 'package:flutter/material.dart';

void main() {
  runApp(new MaterialApp(
    debugShowCheckedModeBanner: false,
    home: new MyHomePage(), // runApp();
  ));

Mastersam07

/// ECX attendance form with form validation on
/// button pressed

import 'package:flutter/material.dart';

void main() {
  runApp(new MaterialApp(
    debugShowCheckedModeBanner: false,
    home: new MyHomePage(), // runApp();
  ));