Immutable Variables in Node.js: The Role of const
In Node.js, the const keyword is used to declare variables that are immutable, meaning their values cannot be reassigned once set. This ensures that the variable holds a constant value throughout its scope, typically block-level. const is particularly useful for defining constants, making your code more predictable and easier to debug. While the value held by a const variable cannot be changed, if it holds an object or array, the contents of the object or array can still be modified. Understanding the scope and usage of const is crucial for writing reliable and maintainable Node.js applications.
This example demonstrates using const in a Node.js script to define a constant value for Pi. Two functions are created to calculate the area and circumference of a circle using this constant. The script then logs the results for a circle with a given radius.
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