Mutability And Immutability In JavaScript Explained In Detail

Mutability And Immutability In JavaScript Explained In Detail

Mutability and Immutability in JavaScript Explained In Detail. The concept of mutability and immutability in JavaScript is essential to understand to avoid errors. Whether a data type is mutable or not. Mutable and Immutable types in JavaScript.

You would often hear the most seasoned react developers suggest using the spread operator to copy an array instead of simply assigning it to a new variable. This has to do with specific data types being a reference type in JavaScript, hence being mutable. The concept of mutability and immutability in JavaScript is essential to understand to avoid errors. Let’s dive deeper into the idea of mutability vs. immutability in JavaScript.

Primitive Types vs. Reference Types in JavaScript

The data assigned to a JavaScript variable can be of two types, the primitive type and the reference type. There is a difference in how JavaScript treats these two data types. To know how they are treated differently, let’s first understand the difference between primitive and reference types.

Primitive Types

Primitive types are simple atomic pieces of data in JavaScript. Primitive types are always saved and accessed by the variable's value and not as a reference to another object. There are six primitive types in JavaScript:

  • undefined
  • null
  • boolean
  • number
  • strings
  • symbol

javascript node-js nodejs ecmascript-6

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