I am trying to loop through a list of colours. When the loop reaches the end I would like it to restart or go to the beginning of the list. Can someone help me I am new to Dart and flutter. Much appreciated!!! Thanks in advance.
List<Color> color = ['Red', 'yellow', 'pink', 'blue'];
So when it gets to blue , I'd like it to go back to Red is that possible. Please help.
as an option:
void main() {
List<String> color = ['Red', 'yellow', 'pink', 'blue'];
for (int i = 0; i < 10; i++) {
print(color[i % color.length]);
}
}
or you can write an extension for List like this:
void main() {
List<String> color = ['Red', 'yellow', 'pink', 'blue'];
for (int i = 0; i < 10; i++) {
print(color.getElement(i));
}
}
extension EndlessElements<T> on List<T> {
T getElement(int index) {
return this[index >= this.length ? index % this.length : index];
}
}
You can use a while loop and get the index in the list by using the remainder.
Not sure what your use case is, but if you are calling it in a builder or something you can just use index%4 to pick a color.
List<Colour> color = ['Red', 'yellow', 'pink', 'blue'];
int count = 0;
while(count < 8){
print(color[count%4]);
count = count + 1;
}
