What are HashMap.entries in Dart?

HashMap is a Hash-table-based implementation of MapMap contains a list of key-value pairs as elements.. Read more about HashMap here.

The entries property can be used to get all entries (key-value pairs) of the map.

Syntax

Iterable<MapEntry<K, V>> get entries;

Return value

This property returns an iterable which contains all the key-value pairs of the map.

Code

The code below demonstrates how to get all the entries of a map.

import 'dart:collection';
void main() {
  //create a new hashmap which can have string type as key, and int type as value
  HashMap map = new HashMap<String, int>();
  
  // add two entries to the map
  map["one"] =  1;
  map["two"] =  2;
  print('\nThe map is $map');
  
  // use entries property to get the entries of the map
  Iterable<MapEntry<String,int>> entries = map.entries;
  
  // using forEach and print the iterable
  print('\nPrinting entries Using forEach');
  entries.forEach((entry){
    var key = entry.key;
    var value = entry.value;
    print('$key - $value');
  }) ;
}

Explanation

In the code above,

  • In line 4, we create a new HashMap object with the name map.

  • In lines 7-8, we add two new entries to the map. Now the map is {one: 1, two: 2}

  • In line 12, we use the entries property to get all the entries of the map. We will get the entries as an Iterable object.

  • In lines 17-21, we use the forEach method of the entries iterable and print all the entries of Iterable.

Free AI Mock Interviews
Coding Interview
Coding PatternsFree Interview
Gain insights and practical experience with coding patterns through targeted MCQs and coding problems, designed to match and challenge your expertise level.
System Design
YouTubeFree Interview
Learn to design a video streaming platform like YouTube by tackling functional and non-functional requirements, core components, and high-level to detailed design challenges.

Free Resources

License: Creative Commons-Attribution-ShareAlike 4.0 (CC-BY-SA 4.0)