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Showing content from https://developer.mozilla.org/en-US/docs/Glossary/Mutable below:

Mutable - Glossary | MDN

Mutable

A mutable value is one that can be changed without creating an entirely new value, in comparison with immutable values.

In JavaScript, objects and arrays are mutable by default — their properties and elements can be changed without creating a new object or array. By contrast, primitive values are immutable — once a primitive value is created, it cannot be changed, although the variable that holds it may be reassigned another value.

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