How to comparing array of object value in dart?
main() {
var datas = [{'name':'Andrew', 'age':31},{'name':'Dorian', 'age':27}];
for( var data in datas){
if(data['age'] > 27 ){
print(data['age']);
}
}
}
because with that code i got this error
The operator '>' isn't defined for the class 'Object'.
Try defining the operator '>'.dart(undefined_operator)
The error says that you can not perform the comparison because the compiler doesn't know the type of data['age'], you can extract the value and assign it to an int variable using as to cast it like this:
var datas = [
{'name': 'Andrew', 'age': 31},
{'name': 'Dorian', 'age': 27}
];
for (var data in datas) {
int age = data['age'] as int;
if (age > 27) {
print(age);
}
}
Or you can declare the array specifying its type instead of using var:
List<Map<String, dynamic>> datas = [
{'name': 'Andrew', 'age': 31},
{'name': 'Dorian', 'age': 27}
];
for (Map<String, dynamic> data in datas) {
if (data['age'] > 27) {
print(data['age']);
}
}
