The size property of Map object accepts a JSON string, and constructs an object based on the given text and, returns it.
Syntax
Its Syntax is as follows
mapVar.size
Example
<html> <head> <title>JavaScript Example</title> </head> <body> <script type="text/javascript"> var mapVar = new Map(); mapVar.set('1', 'Java'); mapVar.set('2', 'JavaFX'); mapVar.set('3', 'HBase'); mapVar.set('4', 'Neo4j'); document.write("Size of the map object: "+mapVar.size); </script> </body> </html>
Output
Size of the map object: 4