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Map.has() function in JavaScript
The has() function of Map object accepts a key in string format and returns a boolean value, if specified key exists it returns true else returns false.
Syntax
Its Syntax is as follows
mapVar.has()
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(mapVar.has('3')); </script> </body> </html>
Output
true
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(mapVar.has('19')); </script> </body> </html>
Output
false
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