Dart Collections: Map Operations | Map Extensions | Map Methods
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Dart provides several operations, extensions, and methods for working with Map collections. Let's explore some of them:
Map Operations:
1. Adding a Key-Value Pair:
- You can add a new key-value pair to a map using the square bracket notation.
Map<String, int> ages = {'Alice': 25, 'Bob': 30};
ages['Charlie'] = 22;
2. Updating a Value for a Key:
- You can update the value associated with a key.
Map<String, int> ages = {'Alice': 25, 'Bob': 30};
ages['Alice'] = 26;
3. Removing a Key-Value Pair:
- You can remove a key-value pair from the map using the
removemethod.
Map<String, int> ages = {'Alice': 25, 'Bob': 30};
ages.remove('Bob');
Map Extensions:
1. forEach:
- Iterates through the map and applies a function to each key-value pair.
Map<String, int> ages = {'Alice': 25, 'Bob': 30};
ages.forEach((key, value) {
print('$key\'s age is $value');
});
Map Methods:
1. containsKey:
- Checks if the map contains a specific key.
Map<String, int> ages = {'Alice': 25, 'Bob': 30};
print(ages.containsKey('Alice')); // Output: true
2. containsValue:
- Checks if the map contains a specific value.
Map<String, int> ages = {'Alice': 25, 'Bob': 30};
print(ages.containsValue(25)); // Output: true
3. keys:
- Returns an iterable of all keys in the map.
Map<String, int> ages = {'Alice': 25, 'Bob': 30};
print(ages.keys); // Output: (Alice, Bob)
4. values:
- Returns an iterable of all values in the map.
Map<String, int> ages = {'Alice': 25, 'Bob': 30};
print(ages.values); // Output: (25, 30)
5. isEmpty:
- Checks if the map is empty.
Map<String, int> ages = {};
print(ages.isEmpty); // Output: true
6. isNotEmpty:
- Checks if the map is not empty.
Map<String, int> ages = {'Alice': 25};
print(ages.isNotEmpty); // Output: true
These are some common operations, extensions, and methods you can use with Dart Map collections. Depending on your specific needs, you can choose the appropriate operation or method for your map manipulation.
