matchesProperty<T> function

Predicate<T> matchesProperty<T>(List property)

Creates a predicate function that checks if a given property of an object matches a specified value.

This function returns a predicate (a function that returns a boolean value) that takes a value, an index, and an array (though it only uses the value) and checks if the value is a map containing a specified property with a specified value. The predicate can be used to filter collections.

The property parameter is a list where the first element is the key of the property to check and the second element is the value to match against.

Example:

var data = [
  {'name': 'Alice', 'age': 30},
  {'name': 'Bob', 'age': 25},
  {'name': 'Charlie', 'age': 30},
];

var predicate = matchesProperty(['age', 30]);
var result = data.where((element) => predicate(element, 0, data)).toList();

print(result); // [{'name': 'Alice', 'age': 30}, {'name': 'Charlie', 'age': 30}]

Type Parameters:

• T: The type of the elements in the collection.

Parameters:

• property (List<dynamic>): A list where the first element is the key to check in the map, and the second element is the value to match.

Returns:

• Predicate<T>: A function that takes a value, an index, and an array, and returns true if the value is a map containing the specified property with the specified value, otherwise returns false.

Implementation

Predicate<T> matchesProperty<T>(List property) {
  return (value, index, array) {
    if (property.length != 2) {
      return false;
    }
    if (value is Map<String, dynamic>) {
      return value[property[0]] == property[1];
    }
    return false;
  };
}