Dart Collections: Dart Map
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In Dart, a Map is a collection that allows you to associate keys with values. Think of it like a real-world dictionary where you look up a word (key) to find its definition (value). In Dart, keys and values can be of any type.
Here's a simple explanation of how to use a Map in Dart:
void main() {
// Creating a Map
Map<String, int> ages = {
'Alice': 25,
'Bob': 30,
'Charlie': 22,
};
// Accessing values using keys
print("Alice's age: ${ages['Alice']}"); // Output: Alice's age: 25
// Adding a new key-value pair
ages['David'] = 28;
// Updating the value for an existing key
ages['Alice'] = 26;
// Removing a key-value pair
ages.remove('Bob');
// Iterating through the Map
ages.forEach((key, value) {
print("$key's age: $value");
});
}
In this example:
We create a Map named ages where keys are String (names) and values are int (ages).
We access values using keys, update values, add new key-value pairs, and remove a key-value pair.
We use forEach to iterate through the Map and print each key-value pair.
In Dart, Map provides a powerful way to organize and retrieve data using keys. Keys are unique within a Map, and they help you efficiently look up associated values.
