map data structure in javascript [duplicate]

Question

This question already has answers here:

What is the 'new' keyword in JavaScript? (18 answers)

What is the difference between `new Object()` and object literal notation? (13 answers)

Why use {} instead of new Object() and use [] instead of new Array() and true/false instead of new Boolean()? (5 answers)

Does JavaScript have a Map literal notation? (4 answers)

Closed 2 years ago.

I'm a beginner and learning data structures and algorithms. I came to know a new data structure called Map.

I am confused why Map is created like this:

const countMap = new Map()

This is unlike other data structures like array where we simply write let array = [];

I searched about this Map syntax and found about constructors and instances etc

If I am correct then I heard about them in OOP. Now should I first learn OOP then continue DSA or what do you suggest?

• Rory McCrossan: Your question is all over the place and not clear at all. I'd suggest you start by reading the MDN documentation for Map() and edit the question to give specific details of where you need assistance.
• Rory McCrossan: Also, let array = []; is just syntactic sugar. It's still calling the Array constructor under the hood, eg: let array = new Array();
• Layhout: i think knowing OOP is a must. it will help you easily understand other language, not just javascript.
• adiga: You can use new Object() and new Array() to create empty object and array as well. {} and [] are literal syntaxes for those. There is no literal to create an empty Map.
• Amadan: You do not need to know OOP to learn about DSA; but you do need to know JavaScript in order to learn DSA with JavaScript — and JavaScript happens to be an object-oriented language. If you were learning DSA with e.g. Scheme, then learning OOP would not be needed, but you would be expected to know about functional programming instead, since that is the paradigm used by Scheme.