CODEWITHSUNDEEP
dart
Sachihiro
Sachihiro

Reputation: 1793

How to Loop through a list of elements

My question is very simple, how can i create a loop that will loop a simple list of elements.

List li=["-","\\","|","/"];

this is my dart list and i want to create this simple animation.

Upvotes: 33

Views: 89991

Answers (4)

Akbar Masterpadi
Akbar Masterpadi

Reputation: 1196

there are may methods to get a loop from list for example we have this type of list

var mylist = [6, 7 ,9 ,8];

using for each method

 mylist.forEach((e){
   print(e);
 });

using for Loop

for (int i=0 ; i<mylist.length; i++){
   var e = mylist[i];
  print(e);
}

Enhanced For loop

for (var e in mylist){
   print(e);
}

using while loop

 var i = 0;
  while(i < mylist.length){
    print(mylist[i]);
   i++;
 }

Upvotes: 4

Reinier Garcia
Reinier Garcia

Reputation: 1780

Another ways of looping through a List in Dart:

Using the forEach method:

  li.forEach((value) {
    var currentElement = value;
  });

Using a While Loop and an Iterator:

// First, get an iterator to the list:
var myListIter = li.iterator;
 
// Iterate over the list:
while(myListIter.moveNext()){
    var currentElement = myListIter.current;
}

Upvotes: 6

Raymond Chenon
Raymond Chenon

Reputation: 12752

Different ways to Loop through a List of elements

1 classic For

for (var i = 0; i < li.length; i++) {
  // TO DO
  var currentElement = li[i];
}

2 Enhanced For loop

for(final e in li){
  //
  var currentElement = e;
}

Notice the keyword final. It means single-assignment, a final variable's value cannot be changed.

3 while loop

var i = 0;
while(i < li.length){
  var currentElement = li[i];
  i++;
}

For the while loop, you will use var to reassign the variable value.

Upvotes: 75

Maria Berinde-Tampanariu
Maria Berinde-Tampanariu

Reputation: 1051

Try this code to loop through a list:

List li=["-","\\","|","/"];
for (var i=0; i<li.length; i++) {
    print(li[i]);
}

As to the animation:

HTML

    <p id="test">
    test
    </p>

Dart

  import 'dart:html';
  import 'dart:async';

  main() async {
  List li = ["-", "\\", "|", "/"];
    for (var i = 0; i < 400000000; i++) {
      querySelector('#test').text = li[i % 4];
      (await new Future.delayed(const Duration(seconds: 1)));
    }
  }

Upvotes: 18

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