JavaScript has()

0
11K

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.

Cerca
Categorie
Leggi tutto
Жизненные вопросы
Земля сынов. The Land of the Sons. (2021)
Конец цивилизации настал. Вода и земля отравлены, выжить практически невозможно. Вдоль реки...
By Nikolai Pokryshkin 2022-09-16 18:52:43 0 36K
Business
Sales leads: types and methods of attraction
What does it mean? Sales leads are users who visited the website, visited the company's page on...
By Dacey Rankins 2024-09-13 19:07:34 0 14K
Marketing and Advertising
What Challenges Do CMOs Face?
The role of the Chief Marketing Officer (CMO) has never been more demanding. Once seen primarily...
By Dacey Rankins 2025-09-25 15:41:02 0 4K
Financial Services
Building a foundation for retirement
Building a foundation for retirement Retirement can mean different things for different...
By Mark Lorenzo 2023-05-24 19:00:14 0 21K
Mental Health
Dyslexia: Stigma and success
Due to the various cognitive processes that dyslexia affects and the overwhelming societal stigma...
By Kelsey Rodriguez 2023-07-11 18:54:34 0 11K

BigMoney.VIP Powered by Hosting Pokrov