JavaScript has()

0
10KB

The has() function of the map object accepts a key in string format and returns a boolean value of true if the specified key exists. Otherwise, the function returns false.

Map is a data structure in JavaScript that allows the storage of [key, value] pairs where any value can be used as either a key or value.

Syntax

mapObject.has(key)

The has() function takes a key in the​ string format. It returns a boolean value that indicates ​the presence of that key in the Map object.

Pesquisar
Categorias
Leia mais
Money
What is National Insurance?
What is National Insurance? National Insurance (NI) is a system of contributions paid by workers...
Por Leonard Pokrovski 2025-09-17 20:13:09 0 3KB
Marketing and Advertising
Top Mistakes to Avoid in Telemarketing — How to Protect Reputation, Compliance, and ROI
Introduction Telemarketing is a powerful channel for building relationships, driving sales, and...
Por Dacey Rankins 2025-11-06 18:22:03 0 963
Business
How Do I Set Up Google Analytics on My Website?
Setting up Google Analytics is one of the most valuable steps you can take to understand your...
Por Dacey Rankins 2025-08-30 00:42:37 0 7KB
Business
What Are the Benefits of Mentoring for the Mentor?
Mentoring is often viewed through the lens of how it benefits the mentee, but the advantages for...
Por Dacey Rankins 2025-05-26 14:01:34 0 5KB
Business
Why Blogging Can't Be Delegated? Or How to Forget About Sales?
I often meet experts who complain about the lack of sales through a blog, and when we start to...
Por Dacey Rankins 2024-09-02 19:10:33 0 12KB

BigMoney.VIP Powered by Hosting Pokrov