Count element in list - flutter

Question

I have a list item:
var listCodeSensations = [4, 3, 2, 3, 2, 4, 3, 4, 2, 5, 2, 2, 3, 4, 5, 6, 0, 4, 8, 3, 2, 1];
And I have in a costant file this model:
static final List<SensationItem> sensationList = [
SensationItem(
code: 0,
title: 'Formicolio / Intorpidimento'),
SensationItem(
code: 1,
title: 'Sudorazione intensa'),
SensationItem(
code: 2, title: 'Dolore al petto'),
SensationItem(code: 3, title: 'Nausea'),
SensationItem(code: 4, title: 'Tremori'),
SensationItem(
code: 5,
title: 'Paura di perdere il controllo',
SensationItem(
code: 6,
title: 'Sbandamento / Vertigini'),
SensationItem(
code: 7, title: 'Palpitazioni'),
SensationItem(
code: 8,
title: 'Sensazione di soffocamento'),
];
}
Now I should insert this in a chartBar (from listCodeSensations) as in the next example:
var dataLine = [
addCharts('Formicolio / Intorpidimento', 10), //title of sensations, count
addCharts('Sudorazione intensa', 20), //title of sensations, count
addCharts('Dolore al petto', 5), //title of sensations, count
addCharts('Nausea', 14), //title of sensations, count
addCharts('Tremori', 18), //title of sensations, count
addCharts('Paura di perdere il controllo', 23), //title of sensations, count
addCharts('Sbandamento / Vertigini', 6), //title of sensations, count
addCharts('Palpitazioni', 1), //title of sensations, count
addCharts('Sensazione di soffocamento', 12), //title of sensations, count
];

Answer 1

Code Updated
const names = [
'Formicolio / Intorpidimento',
'Sudorazione intensa',
'Dolore al petto',
'Nausea',
'Tremori',
'Paura di perdere il controllo',
'Sbandamento / Vertigini',
'Palpitazioni',
'Sensazione di soffocamento',
];
class SensationItem {
final int code;
final String title;
SensationItem({this.code, this.title});
}
class AnyClass {
static final sensationList = List<SensationItem>.generate(names.length, (i) => SensationItem(code: i, title: names[i]));
}
class AddCharts {
final String title;
final int count;
AddCharts(this.title, this.count);
}
void main(List<String> args) {
const data = [4, 3, 2, 3, 2, 4, 3, 4, 2, 5, 2, 2, 3, 4, 5, 6, 0, 4, 8, 3, 2, 1];
var summary = <int, int>{};
data.toSet().toList()
..sort()
..forEach((e) => summary[e] = data.where((i) => i == e).length);
var dataline = List<AddCharts>.generate(names.length, (i) => AddCharts(names[i], summary[i] ?? 0));
print(summary);
}
Result:
{0: 1, 1: 1, 2: 6, 3: 5, 4: 5, 5: 2, 6: 1, 8: 1}