- ES6 Tutorial
- ES6 - Home
- ES6 - Overview
- ES6 - Environment
- ES6 - Syntax
- ES6 - Variables
- ES6 - Operators
- ES6 - Decision Making
- ES6 - Loops
- ES6 - Functions
- ES6 - Events
- ES6 - Cookies
- ES6 - Page Redirect
- ES6 - Dialog Boxes
- ES6 - Void Keyword
- ES6 - Page Printing
- ES6 - Objects
- ES6 - Number
- ES6 - Boolean
- ES6 - Strings
- ES6 - Symbol
- ES6 - New String Methods
- ES6 - Arrays
- ES6 - Date
- ES6 - Math
- ES6 - RegExp
- ES6 - HTML DOM
- ES6 - Iterator
- ES6 - Collections
- ES6 - Classes
- ES6 - Maps And Sets
- ES6 - Promises
- ES6 - Modules
- ES6 - Error Handling
- ES6 - Object Extensions
- ES6 - Reflect API
- ES6 - Proxy API
- ES6 - Validations
- ES6 - Animation
- ES6 - Multimedia
- ES6 - Debugging
- ES6 - Image Map
- ES6 - Browsers
- ES7 - New Features
- ES8 - New Features
- ES9 - New Features
- ES6 Useful Resources
- ES6 - Quick Guide
- ES6 - Useful Resources
- ES6 - Discussion
ES6 - Map Method has()
This function returns true if an element with the specified key exists; otherwise it returns false.
Syntax
The syntax for has() is given below, where, key is the key of the element to test for presence.
myMap.has(key)
Example
<script> let andy = {ename:"Andrel"}, varun = {ename:"Varun"}, prijin = {ename:"Prijin"} let empJobs = new Map([ [andy,'Software Architect'], [varun,'Developer']] ); console.log(empJobs.has(prijin)) console.log(empJobs.size) </script>
The output of the above code is as mentioned below −
false 2
Advertisements