javascript

Pure And Impure Functions in Javascript

Pure Functions

A pure function in Javascript is one that given the same input will always return the same output and does not have any observable side effect.

This means that it does not depend on or change any state outside of the function and will always return the same output value for the same input.

Example

add = (a, b) => {
return a+b;
}
console.log(add(3,4)); //7

Impure Functions

The outcome of an impure function on the other hand depends on any change outside of the function and will not return the same output value for the same input.

Example

let minimum = 21;
let checkAge = function(age){
return age > minimum;
}
console.log(checkAge(22)); //True

In the above example, the outcome of the program depends on the value assigned to the minimum variable. If that variable changes, the function will not return the same output value even if the input remains constant.

THE END

Recent Posts

What is a QR Code And How to Create One

QR codes have evolved from a niche tracking technology to an indispensable digital connector, seamlessly…

1 week ago

Will AI Replace Software Developers?

Artificial Intelligence (AI) has made remarkable progress in recent years, transforming industries such as healthcare,…

2 weeks ago

Can Tech Really Solve Climate Change—Or Is It Just Greenwashing?

Climate change is one of the most pressing challenges of our time, with rising global…

3 weeks ago

The Inevitable Rise of Transhumanism

In the last few decades, technology has become so embedded in our daily lives that…

3 weeks ago

Drones 101: What They Are & How They Work

In recent years, drones have become more than just cool gadgets or tools for tech…

4 weeks ago

React Native vs. Flutter: Which is Best to Build Mobile Apps in Abuja?

Looking to build mobile apps in Abuja? Choosing the right framework is crucial for performance,…

1 month ago