What is an example of an immutable object in JavaScript?

An immutable object is an object whose state cannot be modified after it is created. Examples of native JavaScript values that are immutable are numbers and strings. Examples of native JavaScript values that are mutable include objects, arrays, functions, classes, sets, and maps.

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Furthermore, are strings immutable in JavaScript?

The reason is that strings are immutable – they cannot change, we can only ever make new strings. Strings are not the only immutable values built into JavaScript. Numbers are immutable too.

One may also ask, what is immutable in programming? In object-oriented and functional programming, an immutable object (unchangeable object) is an object whose state cannot be modified after it is created. This is in contrast to a mutable object (changeable object), which can be modified after it is created.

Also know, why is JavaScript immutable?

Besides reduced memory usage, immutability allows you to optimize your application by making use of reference- and value equality. This makes it really easy to see if anything has changed. For example a state change in a react component.

Do I need immutable JS?

When working with React and Redux, immutable data helps reinforce one of their core principles: if the app state has not changed, neither should the DOM. Many articles have been written about the benefit of using immutable data, some of the main benefits include: Removed requirement for defensive copying of data.