Javascript Pure Functions

In JavaScript, a pure function is a function that has the following characteristics:

1. It always returns the same result for a given set of inputs.
2. It does not have any side effects, meaning it does not modify any external state or variables.
3. It does not depend on any external state or variables.

Pure functions are an important concept in functional programming, as they are predictable and easy to understand. They are also easier to test and debug, as you can be sure that the output of a pure function will always be the same for a given set of inputs.

One of the benefits of using pure functions is that they can be composed and combined to create more complex behavior. For example, you could create a series of small, pure functions that each perform a specific task, and then combine those functions to create a more complex program.

To create a pure function in JavaScript, you simply need to make sure that the function meets the above criteria. This means avoiding using any external state or variables, and making sure that the function always returns the same result for a given set of inputs.

Here is an example of a pure function in JavaScript:

function add(a, b) {
return a + b;
}

This function takes two arguments, a and b, and returns the result of adding them together. It does not depend on any external state or variables, and it always returns the same result for a given set of inputs.

Overall, pure functions are an important concept in JavaScript and functional programming. They are predictable, easy to understand, and easy to test, making them a useful tool for creating maintainable and reliable code.