Hashmap Data Structure in Javascript, Example with Node.js

1. // Author: Arda Basoglu, [email protected]
2. // This example demonstrates the use of map like (like hash map in Java and dictionary in C#) data structure
3. // The code is tested with a machine Node.js installed
4. // If you have Node.js installed on your machine run the script by writing "node map.example.js" on the console
5.  
6. // create a map
7. var map = {};
8.  
9. // Add key, value pairs into the map with random strings
10. for (var i = 0; i < 500; i++) {
11.     var item =generateRandomString();
12.     var value = generateRandomString();
13.     map[item] = value;
14. };
15.  
16. // Output every key, value pair onto the screen
17. for (var i in map) {
18.     console.log("Key: " + i + ", Value: " + map[i]);
19. }
20.  
21. // The function required for generating random strings
22. function generateRandomString()
23. {
24.     var randomString = "";
25.     var randomStringSource = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789";
26.  
27.     for( var i=0; i < 5; i++ ){
28.         randomString += randomStringSource.charAt(Math.floor(Math.random() * randomStringSource.length));
29.     }
30.    
31.     return randomString;
32. }