matches function

Predicate<Map<String, dynamic>> matches(Map<String, dynamic> source)

Returns a predicate function that checks whether a given map matches the provided source map.

The source map contains key-value pairs against which the given map will be tested for equality.

Example:

Map<String, dynamic> source = {'name': 'John', 'age': 30};
var predicate = matches(source);

Map<String, dynamic> person1 = {'name': 'John', 'age': 30};
Map<String, dynamic> person2 = {'name': 'Jane', 'age': 25};

print(predicate(person1)); // Output: true
print(predicate(person2)); // Output: false

• Parameter source: A map containing key-value pairs to match against.
• Returns: A predicate function that returns true if the given map matches the source map, false otherwise.

Implementation

Predicate<Map<String, dynamic>> matches(Map<String, dynamic> source) {
  return (value, index, array) {
    for (var key in source.keys) {
      if (value[key] != source[key]) {
        return false;
      }
    }
    return true;
  };
}