1.10) Exercise 3 (Lists) Solution | The Complete (FREE) Flutter Course

[@michaelschneider729]

And here's my solution:
String lpad2(int value) => '$value'.padLeft(2, '0');
String formatTime(int minutes) =>
'${lpad2(minutes ~/ 60)}:${lpad2(minutes % 60)}';
void main() {
const quaterHoursPerDay = 24 * 4;
final timeFormatted = [for (var i = 0; i < quaterHoursPerDay; i++) i * 15]
.map(formatTime)
.toList();
timeFormatted.forEach(print);
}
Ok, I'm using list-for which you didn't mention, but the initial list of quarter hours can on course be built from an empty list by adding the values in a for-loop equal to my list-for.

[@SaveaBowls]

First, let me say that I started watching your videos because you give a more complete overview of proper OOP than many others I've seen on youtube. I was just looking for a quick overview on Dart "Classes" and you were the first person I have ever seen that actually mentions getters and setters from a security standpoint. As you probably know - JS does't have private properties so I tended to use a functional programming approach when using it. I never took a programming course and I am really just a hobbiest at the moment, but I figured I could probably learn some good stuff from you.

[@sb-jo2ch]

nested loop
void main() {
List fifteenMinuteIncrements = [];
for (int hr=0; hr

[@mohammedsadiq1567]

I completed the entire module 1 in one sit!
Great content, mate!

[@ovidiusmazuru9201]

That's awesome, great dedication

[@Jan123.]

Nice one (though this modulo stuff is still hard for me. I did use nested for-loops.)

[@Ester_Krupova]

Why is the tempStr in if-else statement instead of just tempStr = '${hours > 9 ? hours : '0$hours'}:'; ? When the value of hours is 0, it looks the same as the String in else { }.

[@ovidiusmazuru9201]

Great point. I was probably just distracted trying to record and code at the same time (it's much easier now, but it did not come naturally at first). Looking at the code now, I see no reason to include that extra if else

[@paulvickers8059]

I have a solution I will post before watching this video, it works, but I am not sure I am doing all you are asking, as i didn't use the map function, I didn't understand it that well, I just used lists and for loops.
void main() {
exercise3Solution();
}
exercise3Solution() {

List hour = ['00', '01', '02', '03', '04', '05', '06', '07', '08', '09', '10', '11', '12', '13', '14', '15', '16', '17', '18', '19', '20', '21', '22', '23'];
List minutes = ['00', '15', '30', '45'];

int i2;

for(int i =0; i < hour.length; i++) {
for(int i2 = 0; i2 < minutes.length; i2++){
print('${hour[i]}:${minutes[i2]}');
}
}
}

[@ovidiusmazuru9201]

It's a good solution; it works. One tiny tiny thing though, rather than using i2 in the 2nd for loop, usually we'd use j. Then k if you have a 3rd loop and so on

[@paulvickers8059]

@@ovidiusmazuru9201 thanks that's good to know, I was thinking what to use, so I just thought i2, I thought the I was for index, so I thought index 2, but I will use j in future, i2 doesn't look good.

[@mohammedsadiq1567]

void main() {
List list = generateTime();
for(int i = 0; i < list.length; i++){
print(list[i]);
}
}
List generateTime(){
List myList = [];
int startPreColon = 0;
int startPostColon = 0;
String preColon = "";
String postColon = "";
while(true){
postColon = handleTime(startPostColon, 60);
preColon = handleTime(startPreColon, 24);
myList.add(preColon + ":" + postColon);
startPostColon += 15;
if(startPostColon % 60 == 0) startPreColon += 1;
if((startPreColon) == 24 && (startPostColon % 60 == 0)) break;
}
return myList;
}
String handleTime(int number, int modulo){
int result = number % modulo;
if(result < 10){
return "0" + result.toString();
}
return result.toString();
}