How to create an Empty Map in Dart


How to create an Empty Map in Dart ?

Answer

To create an empty map in Dart, you can use the Map constructor. This creates a new, empty Map object.



✐ Examples

1 Creating an Empty Map

We can create an empty map in Dart using the Map constructor, which initializes a map with no key-value pairs.

For example,

  1. We start by declaring a variable named emptyMap. This variable will hold our empty map.
  2. We then use the Map() constructor to create a new, empty Map object. In Dart, the Map() constructor initializes the map with no key-value pairs.
  3. The newly created map is now assigned to the emptyMap variable. In this example, the map has string keys and integer values.
  4. We can now perform various operations on this empty map, such as adding key-value pairs, checking for the presence of keys, and retrieving values.

Dart Program

void main() {
    // Declare an empty map
    Map<String, int> emptyMap = {};

    // Operations on the empty map
    // ...

    print(emptyMap);
}

Output

{}

Summary

In this tutorial, we learned How to create an Empty Map in Dart language with well detailed examples.




More Dart Maps Tutorials

  1. How to create an Empty Map in Dart ?
  2. How to create a Map with Initial Key-Value Pairs in Dart ?
  3. How to Print a Map in Dart ?
  4. How to Add a Key-Value Pair to a Map in Dart ?
  5. How to Set a Default Value for a Key in a Map in Dart ?
  6. How to Update the Value for a Key in a Map in Dart ?
  7. How to Check if a Map is Empty in Dart ?
  8. How to Check if a Key Exists in a Map in Dart ?
  9. How to Check if a Value Exists in a Map in Dart ?
  10. How to Get the Value Associated with a Key in a Map in Dart ?
  11. How to Remove a Key-Value Pair from a Map in Dart ?
  12. How to Remove Key-Value Pairs from a Map Based on Values in Dart ?
  13. How to Clear All Key-Value Pairs from a Map in Dart ?
  14. How to Iterate Over Keys in a Map in Dart ?
  15. How to Iterate Over Values in a Map in Dart ?
  16. How to Iterate Over Entries (Key-Value Pairs) in a Map in Dart ?
  17. How to Get the Size (Number of Key-Value Pairs) of a Map in Dart ?
  18. How to Convert a Map to an Array of Keys in Dart ?
  19. How to Convert a Map to an Array of Values in Dart ?
  20. How to Convert a Map to an Array of Key-Value Pairs in Dart ?
  21. How to Merge Two Maps in Dart ?
  22. How to Check if Two Maps are Equal in Dart ?
  23. How to Sort a Map by Keys in Dart ?
  24. How to Sort a Map by Values in Dart ?
  25. How to Filter a Map Based on Keys in Dart ?
  26. How to Filter a Map Based on Values in Dart ?
  27. How to Reduce Values in a Map to a Single Value in Dart ?
  28. How to Convert an Array of Key-Value Pairs to a Map in Dart ?
  29. How to Convert a Map to a JSON String in Dart ?
  30. How to Convert a JSON String to a Map in Dart ?
  31. How to Swap Keys and Values in a Map in Dart ?
  32. How to Create a Map of Maps in Dart ?
  33. How to Iterate Over a Map of Maps in Dart ?