Iterating over maps in List and matching value in Dart - list

Question

please help with code to print value of key c by comparing key value of a and b
the output should be 29
int a = 3;
int b = 6;
List nums = [
{'a': 1, 'b': 6, 'c': 9},
{'a': 1, 'b': 7, 'c': 10},
{'a': 3, 'b': 8, 'c': 19},
{'a': 3, 'b': 6, 'c': 29},
{'a': 2, 'b': 7, 'c': 39},
{'a': 2, 'b': 8, 'c': 49},
];

Answer 1

As per https://api.dart.dev/stable/2.16.2/dart-core/Iterable/where.html
void main() {
int a = 3;
int b = 6;
List nums = [
{'a': 1, 'b': 6, 'c': 9},
{'a': 1, 'b': 7, 'c': 10},
{'a': 3, 'b': 8, 'c': 19},
{'a': 3, 'b': 6, 'c': 29},
{'a': 2, 'b': 7, 'c': 39},
{'a': 2, 'b': 8, 'c': 49},
];
print(nums.where((m) => m['a'] == a && m['b'] == b));
print(nums.where((m) => m['a'] == a && m['b'] == b).elementAt(0)['c']);
}
the output will be
({a: 3, b: 6, c: 29})
29

Answer 2

The following code will output 29.
main(){
int a = 3;
int b = 6;
List nums = [
{'a': 1, 'b': 6, 'c': 9},
{'a': 1, 'b': 7, 'c': 10},
{'a': 3, 'b': 8, 'c': 19},
{'a': 3, 'b': 6, 'c': 29},
{'a': 2, 'b': 7, 'c': 39},
{'a': 2, 'b': 8, 'c': 49},
];
for(var item in nums){
if(item['a'] == a && item['b'] == b){
print(item['c']); // => 29
}
}
}