This content originally appeared on Bits and Pieces - Medium and was authored by Aman
There are 8 basic data types in JavaScript.
- Null
- Undefined
- Number
- Boolean
- BigInts
- Object
- String
- Symbol
How to remember them? Learn the mnemonic: NUNBBOSS.
Now that we know there are 8 data types, what exactly are these data types used for?
Of the 8 data types, 7 are primitive. And what exactly does “primitive” mean?
A primitive data type can contain only a single thing. All primitive types are immutable and we cannot set properties on them.
Objects are the only non-primitive type because they are used to store collections of data and more complex entities.
You might be thinking, “Hey but I heard that everything in JavaScript is an object! If a string is not an object, how come I can do the following:
The above logic makes the string “hi” look like an object because we are using a method on it. This is an illusion! JavaScript will create a temporary object when we want to use a method for a primitive type and then immediately discard it!
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JavaScript Interview Question: What are the 8 Data Types in JavaScript? was originally published in Bits and Pieces on Medium, where people are continuing the conversation by highlighting and responding to this story.
This content originally appeared on Bits and Pieces - Medium and was authored by Aman
Aman | Sciencx (2022-03-23T08:55:30+00:00) JavaScript Interview Question: What are the 8 Data Types in JavaScript?. Retrieved from https://www.scien.cx/2022/03/23/javascript-interview-question-what-are-the-8-data-types-in-javascript/
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