Why Functional Programming Should Be the Future of Software Development – IEEE Spectrum

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It’s hard to learn, but your code will produce fewer nasty surprises
You’d expectthe longest and most costly phase in the lifecycle of a software product to be the initial development of the system, when all those great features are first imagined and then created. In fact, the hardest part comes later, during the maintenance phase. That’s when programmers pay the price for the shortcuts they took during development.
So why did they take shortcuts? Maybe they didn’t realize that they were cutting any corners. Only when their code was deployed and exercised by a lot of users did its hidden flaws come to light. And maybe the developers were rushed. Time-to-market pressures would almost guarantee that their software will contain more bugs than it would otherwise.
The struggle that most companies have maintaining code causes a second problem: fragility. Every new feature that gets added to the code increases its complexity, which then increases the chance that something will break. It’s common for software to grow so complex that the developers avoid changing it more than is absolutely necessary for fear of breaking something. In many companies, whole teams of developers are employed not to develop anything new but just to keep existing systems going. You might say that they run a software version of the Red Queen’s race, running as fast as they can just to stay in the same place.
It’s a sorry situation. Yet the current trajectory of the software industry is toward increasing complexity, longer product-development times, and greater fragility of production systems. To address such issues, companies usually just throw more people at the problem: more developers, more testers, and more technicians who intervene when systems fail.
Surely there must be a better way. I’m part of a growing group of developers who think the answer could be functional programming. Here I describe what functional programming is, why using it helps, and why I’m so enthusiastic about it.
A good way to understand the rationale for functional programming is by considering something that happened more than a half century ago. In the late 1960s, a programming paradigm emerged that aimed to improve the quality of code while reducing the development time needed. It was called structured programming.
Various languages emerged to foster structured programming, and some existing languages were modified to better support it. One of the most notable features of these structured-programming languages was not a feature at all: It was the absence of something that had been around a long time— the GOTO statement.
The GOTO statement is used to redirect program execution. Instead of carrying out the next statement in sequence, the flow of the program is redirected to some other statement, the one specified in the GOTO line, typically when some condition is met.
The elimination of the GOTO was based on what programmers had learned from using it—that it made the program very hard to understand. Programs with GOTOs were often referred to as spaghetti code because the sequence of instructions that got executed could be as hard to follow as a single strand in a bowl of spaghetti.
A plate of spaghetti made from code with a single strand of "spaghetti code" being pulled from the top of the frame in a neverending loop on a blue gradient background.Shira Inbar
The inability of these developers to understand how their code worked, or why it sometimes didn’t work, was a complexity problem. Software experts of that era believed that those GOTO statements were creating unnecessary complexity and that the GOTO had to, well, go.
Back then, this was a radical idea, and many programmers resisted the loss of a statement that they had grown to rely on. The debate went on for more than a decade, but in the end, the GOTO went extinct, and no one today would argue for its return. That’s because its elimination from higher-level programming languages greatly reduced complexity and boosted the reliability of the software being produced. It did this by limiting what programmers could do, which ended up making it easier for them to reason about the code they were writing.
Although the software industry has eliminated GOTO from modern higher-level languages, software nevertheless continues to grow in complexity and fragility. Looking for how else such programming languages could be modified to avoid some common pitfalls, software designers can find inspiration, curiously enough, from their counterparts on the hardware side.
In designing hardware for a computer, you can’t have a resistor shared by, say, both the keyboard and the monitor’s circuitry. But programmers do this kind of sharing all the time in their software. It’s called shared global state: Variables are owned by no one process but can be changed by any number of processes, even simultaneously.

Now, imagine that every time you ran your microwave, your dishwasher’s settings changed from Normal Cycle to Pots and Pans. That, of course, doesn’t happen in the real world, but in software, this kind of thing goes on all the time. Programmers write code that calls a function, expecting it to perform a single task. But many functions have side effects that change the shared global state, giving rise to unexpected consequences.
In hardware, that doesn’t happen because the laws of physics curtail what’s possible. Of course, hardware engineers can mess up, but not like you can with software, where just too many things are possible, for better or worse.
Another complexity monster lurking in the software quagmire is called a null reference, meaning that a reference to a place in memory points to nothing at all. If you try to use this reference, an error ensues. So programmers have to remember to check whether something is null before trying to read or change what it references.
Nearly every popular language today has this flaw. The pioneering computer scientist Tony Hoare introduced null references in the ALGOL language back in 1965, and it was later incorporated into numerous other languages. Hoare explained that he did this “simply because it was so easy to implement,” but today he considers it to be a “billion-dollar mistake.” That’s because it has caused countless bugs when a reference that the programmer expects to be valid is really a null reference.
Software developers need to be extremely disciplined to avoid such pitfalls, and sometimes they don’t take adequate precautions. The architects of structured programming knew this to be true for GOTO statements and left developers no escape hatch. To guarantee the improvements in clarity that GOTO-free code promised, they knew that they’d have to eliminate it entirely from their structured-programming languages.
History is proof that removing a dangerous feature can greatly improve the quality of code. Today, we have a slew of dangerous practices that compromise the robustness and maintainability of software. Nearly all modern programming languages have some form of null references, shared global state, and functions with side effects—things that are far worse than the GOTO ever was.
How can those flaws be eliminated? It turns out that the answer has been around for decades: purely functional programming languages.

Of the top dozen functional-programming languages, Haskell is by far the most popular, judging by the number of GitHub repositories that use these languages.

Of the top dozen functional-programming languages, Haskell is by far the most popular, judging by the number of GitHub repositories that use these languages.
The first purely functional language to become popular, called Haskell, was created in 1990. So by the mid-1990s, the world of software development really had the solution to the vexing problems it still faces. Sadly, the hardware of the time often wasn’t powerful enough to make use of the solution. But today’s processors can easily manage the demands of Haskell and other purely functional languages.
Indeed, software based on pure functions is particularly well suited to modern multicore CPUs. That’s because pure functions operate only on their input parameters, making it impossible to have any interactions between different functions. This allows the compiler to be optimized to produce code that runs on multiple cores efficiently and easily.
As the name suggests, with purely functional programming, the developer can write only pure functions, which, by definition, cannot have side effects. With this one restriction, you increase stability, open the door to compiler optimizations, and end up with code that’s far easier to reason about.
But what if a function needs to know or needs to manipulate the state of the system? In that case, the state is passed through a long chain of what are called composed functions—functions that pass their outputs to the inputs of the next function in the chain. By passing the state from function to function, each function has access to it and there’s no chance of another concurrent programming thread modifying that state—another common and costly fragility found in far too many programs.
A comparison of Javascript and Purescript shows how the latter can help programmers avoid bugs.

Functional programming also has a solution to Hoare’s “billion-dollar mistake,” null references. It addresses that problem by disallowing nulls. Instead, there is a construct usually called Maybe (or Option in some languages). A Maybe can be Nothing or Just some value. Working with Maybes forces developers to always consider both cases. They have no choice in the matter. They must handle the Nothing case every single time they encounter a Maybe. Doing so eliminates the many bugs that null references can spawn.
Functional programming also requires that data be immutable, meaning that once you set a variable to some value, it is forever that value. Variables are more like variables in math. For example, to compute a formula, y = x2 + 2x – 11, you pick a value for x and at no time during the computation of y does x take on a different value. So, the same value for x is used when computing x2 as is used when computing 2x. In most programming languages, there is no such restriction. You can compute x2 with one value, then change the value of x before computing 2x. By disallowing developers from changing (mutating) values, they can use the same reasoning they did in middle-school algebra class.
Unlike most languages, functional programming languages are deeply rooted in mathematics. It’s this lineage in the highly disciplined field of mathematics that gives functional languages their biggest advantages.
Why is that? It’s because people have been working on mathematics for thousands of years. It’s pretty solid. Most programming paradigms, such as object-oriented programming, have at most half a dozen decades of work behind them. They are crude and immature by comparison.
Imagine if every time you ran your microwave, your dishwasher’s settings changed from Normal Cycle to Pots and Pans. In software, this kind of thing goes on all the time.
Let me share an example of how programming is sloppy compared with mathematics. We typically teach new programmers to forget what they learned in math class when they first encounter the statement x = x + 1. In math, this equation has zero solutions. But in most of today’s programming languages, x = x + 1 is not an equation. It is a statement that commands the computer to take the value of x, add one to it, and put it back into a variable called x.
In functional programming, there are no statements, only expressions. Mathematical thinking that we learned in middle school can now be employed when writing code in a functional language.
Thanks to functional purity, you can reason about code using algebraic substitution to help reduce code complexity in the same way you reduced the complexity of equations back in algebra class. In non-functional languages (imperative languages), there is no equivalent mechanism for reasoning about how the code works.
Pure functional programming solves many of our industry’s biggest problems by removing dangerous features from the language, making it harder for developers to shoot themselves in the foot. At first, these limitations may seem drastic, as I’m sure the 1960s developers felt regarding the removal of GOTO. But the fact of the matter is that it’s both liberating and empowering to work in these languages—so much so that nearly all of today’s most popular languages have incorporated functional features, although they remain fundamentally imperative languages.
The biggest problem with this hybrid approach is that it still allows developers to ignore the functional aspects of the language. Had we left GOTO as an option 50 years ago, we might still be struggling with spaghetti code today.
To reap the full benefits of pure functional programming languages, you can’t compromise. You need to use languages that were designed with these principles from the start. Only by adopting them will you get the many benefits that I’ve outlined here.
But functional programming isn’t a bed of roses. It comes at a cost. Learning to program according to this functional paradigm is almost like learning to program again from the beginning. In many cases, developers must familiarize themselves with math that they didn’t learn in school. The required math isn’t difficult—it’s just new and, to the math phobic, scary.
More important, developers need to learn a new way of thinking. At first this will be a burden, because they are not used to it. But with time, this new way of thinking becomes second nature and ends up reducing cognitive overhead compared with the old ways of thinking. The result is a massive gain in efficiency.
But making the transition to functional programming can be difficult. My own journey doing so a few years back is illustrative.
I decided to learn Haskell—and needed to do that on a business timeline. This was the most difficult learning experience of my 40-year career, in large part because there was no definitive source for helping developers make the transition to functional programming. Indeed, no one had written anything very comprehensive about functional programming in the prior three decades.
To reap the full benefits of pure functional programming languages, you can’t compromise. You need to use languages that were designed with these principles from the start.
I was left to pick up bits and pieces from here, there, and everywhere. And I can attest to the gross inefficiencies of that process. It took me three months of days, nights, and weekends living and breathing Haskell. But finally, I got to the point that I could write better code with it than with anything else.
When I decided that our company should switch to using functional languages, I didn’t want to put my developers through the same nightmare. So, I started building a curriculum for them to use, which became the basis for a book intended to help developers transition into functional programmers. In my book, I provide guidance for obtaining proficiency in a functional language called PureScript, which stole all the great aspects of Haskell and improved on many of its shortcomings. In addition, it’s able to operate in both the browser and in a back-end server, making it a great solution for many of today’s software demands.
While such learning resources can only help, for this transition to take place broadly, software-based businesses must invest more in their biggest asset: their developers. At my company, Panoramic Software, where I’m the chief technical officer, we’ve made this investment, and all new work is being done in either PureScript or Haskell.
We started down the road of adopting functional languages three years ago, beginning with another pure functional language called Elm because it is a simpler language. (Little did we know we would eventually outgrow it.) It took us about a year to start reaping the benefits. But since we got over the hump, it’s been wonderful. We have had no production runtime bugs, which were so common in what we were formerly using, JavaScript on the front end and Java on the back. This improvement allowed the team to spend far more time adding new features to the system. Now, we spend almost no time debugging production issues.
But there are still challenges when working with a language that relatively few others use—in particular, the lack of online help, documentation, and example code. And it’s hard to hire developers with experience in these languages. Because of that, my company uses recruiters who specialize in finding functional programmers. And when we hire someone with no background in functional programming, we put them through a training process for the first few months to bring them up to speed.
My company is small. It delivers software to governmental agencies to enable them to help veterans receive benefits from the U.S. Department of Veteran’s Affairs. It’s extremely rewarding work, but it’s not a lucrative field. With razor-slim margins, we must use every tool available to us to do more with fewer developers. And for that, functional programming is just the ticket.
It’s very common for unglamorous businesses like ours to have difficulty attracting developers. But we are now able to hire top-tier people because they want to work on a functional codebase. Being ahead of the curve on this trend, we can get talent that most companies our size could only dream of.
I anticipate that the adoption of pure functional languages will improve the quality and robustness of the whole software industry while greatly reducing time wasted on bugs that are simply impossible to generate with functional programming. It’s not magic, but sometimes it feels like that, and I’m reminded of how good I have it every time I’m forced to work with a non-functional codebase.
One sign that the software industry is preparing for a paradigm shift is that functional features are showing up in more and more mainstream languages. It will take much more work for the industry to make the transition fully, but the benefits of doing so are clear, and that is no doubt where things are headed.
Charles Scalfani is the CTO for Panoramic Software in Dana Point, Calif.
Languages like C/C++ allow almost any tiny programmer mistake, anywhere a software application, to be used by hackers/malware to take-over the whole computer system & & so, they need to be replaced by modern/safer programming languages!
But also basic design of desktop OS like Windows, Linux, MacOS needs to be modified so that OS can easily catch software errors & stop execution!
They need to run more like interpreters or VM running bytecode!
So they need to be like smartphone OS like Android & iOS!

I've been coding for over 40y and I disagree.
While I apply a number of functional techniques, it cannot do everything well. That is why there is a variety of languages and paradigms.
If anything is the future of software development, it will be no-code…
Thanks for a very interesting article! I've recently started learning functional programming after coding using imperative languages for over 30 years. It's been a real eye opener. My experience so far aligns with everything you're saying in this article. I do a lot of work with .NET so I'm learning F# which has excellent compatibility with .NET and I'm finding it to be a very productive language. I noticed that F# didn't appear in the top dozen functional programming languages on github that you listed. Just wondering if F# doesn't make the top 12 in terms of popularity or if the list is focused more on "pure" functional languages?
The essential part of the IoT is becoming a target for cyberattacks
Sensors enabled by the Internet of Things are network-connected smart devices that collect and transmit real-time data about their environment. The data they provide lets people make better-informed decisions.
The use of IoT sensors has grown explosively in recent years because their increasing functionality, small size, and low power consumption allow designers to deploy them in new applications to increase productivity and lower costs. The sensors are being used in new ways to maximize the capabilities of network-connected systems and infrastructure.
The sensors are poised for mass-scale adoption in fields including automotive, health care, industrial automation, energy, and smart cities. But the lack of standardization in IoT sensors, coupled with interoperability challenges, has made them vulnerable to cyberattacks—which creates barriers for their ubiquitous use. Hackers are targeting IoT sensors in greater numbers, in more industries, and with increased sophistication.
A cyberattack can lead to financial penalties and legal issues if it renders a business or organization unable to fulfill its contractual obligations. An attack could harm the corporate brand and generate user mistrust of affected systems. It is costly and time-consuming to repair damage caused by an attack.
More concerning is the inability to collect and transmit uncorrupted data in real time from critical applications such as with network-connected medical devices. The growing use of such medical devices to monitor and treat diabetes and other conditions depends on sensor cybersecurity.
Cyberattackers are targeting IoT sensors in greater numbers, in more industries, and with increased sophistication. Interoperability challenges reduce the ability to access the sensors and the data they publish.

Another area where sensor cybersecurity is essential is smart cities, a recently growing market. Smart cities use networks that rely on systems of IoT-enabled sensors to gather data to improve local services, allocate resources more effectively, and manage traffic signals and other infrastructure. If compromised sensors fail to send timely, accurate information, then safety issues might arise. People and property could be in danger if warnings about fires, chemical spills, or other emergency situations fail to reach public safety officials in time.
The power and energy sector could significantly benefit from sensor cybersecurity and interoperability to help determine when and where to efficiently distribute power.
Consider the U.S. grid, which comprises about 7,300 power plants; 160,000 miles of high-voltage power lines; and millions of miles of low-voltage power lines and distribution transformers, according to the U.S. Energy Information Administration. The grid consists of equipment of varying vintages and different technologies, is operated by many companies, and is serviced by vendors with differing cybersecurity practices. Achieving adequate cybersecurity in such a large, disjointed system is a monumental challenge, but it could have a great impact on autonomous control of power systems.
In industry, automated systems are critical to improving operational efficiency and precision manufacturing, helping to make up for worker shortages. But when the IoT sensors in automated or semiautomated systems fail to operate, workers could be injured or exposed to toxic substances, and operations could be disrupted.
The IEEE Standards Association has a growing portfolio of standards and projects that address different aspects of IoT sensors. Here are a few of them:
IEEE 1451 is a series of standards and projects that describe a set of open, common, network-independent communication interfaces for connecting sensors or actuators to microprocessors, instrumentation systems, and control/field networks. The goal of the series is to allow access of sensor/actuator data through a common set of interfaces, whether they are connected to systems or networks by wired or wireless means.
The IEEE 2700 Standard for Sensor Performance Parameter Definitions provides a common framework for performance specification terminology, units, conditions, and limits. The standard addresses accelerometers, magnetometers, gyrometers/gyroscopes, accelerometer/magnetometer/gyroscope combination sensors, barometer/pressure sensors, hygrometer/humidity sensors, temperature sensors, light sensors, and proximity sensors.
IEEE P2888 is a series of standards projects that address a multitude of areas for virtual reality and augmented reality, including sensor interfaces.
The IEEE 2621 series of standards defines the concept of cybersecurity assurance for wireless diabetes devices, and it specifies security requirements. It also provides instructions on how to achieve assurance.
Promising new experimental direction for Parkinson’s, epilepsy, depression, and OCD therapies
Prachi Patel is a freelance journalist based in Pittsburgh. She writes about energy, biotechnology, materials science, nanotechnology, and computing.
A new experimental, batteryless, surgically implanted brain device for chronic conditions and neurodegenerative disorders is bolstering hopes in the eternal quest for maximally effective but minimally invasive treatments.
Neural implants that electrically stimulate tissue deep in the brain are used today to treat Parkinson’s disease and epilepsy. Researchers have also shown recently that deep-brain simulation can be used to treat mental disorders such as addiction, depression, obsessive-compulsive disorder, and post-traumatic stress disorder.

The batteries that power these deep-brain stimulation (DBS) implants last for about three years. However, surgery to replace the bulky batteries can add cost and increase the risk of infection. To get around that problem, researchers have made a DBS system that powers itself by harvesting and storing energy from the motion of breathing lungs.
“Deep-brain stimulators are energy monsters so the battery runs out very quickly,” says Islam Mosa, a chemist and chief technology officer of University of Connecticut spinoff VoltXon, which is commercializing the system reported in the journal Cell Reports Physical Science. “We have created the first self-sustainable and battery-free deep-brain stimulating device.”
Deep-brain stimulation uses electrodes surgically implanted in the deep interior part of the brain to send electrical impulses at varying frequencies via electrodes. A pulse generator placed under the skin just below the collarbone fires the electrodes through a wire under the skin that runs up the neck to the skull.
Those electrical pulses have to be delivered to the brain in a controlled manner. Past efforts to make battery-free DBS systems that rely on harvesting the body’s mechanical energy have either not been able to deliver pulses with controlled frequency or haven’t generated enough power to trigger the electrodes.

Mosa, UConn chemistry professor James Rusling, and their colleagues developed a new type of triboelectric nanogenerator (TENG) to harvest energy from lung movements, and a supercapacitor to store that energy. Both devices are superthin and flexible.
TENGs rely on the buildup of electrical charge when repeated movements cause their two electrodes, made of dissimilar materials, to separate and come together. They have been demonstrated to generate power from footsteps, muscle motion, and wind, among other things, but have yet to be commercialized on a large scale.
The new TENG relies on the contact and separation of films made of two different plastics. But the researchers also added an extra “biographene” layer—which they make by coating a carbon microfiber fabric with graphene flakes and a protein. This biographene serves as an additional TENG, Mosa says, because of the relative movement between the carbon materials and protein, boosting the energy produced by the TENG. The entire device is the thickness of paper, and a 4- by 5-centimeter device generates 6.9 microwatts for each contact-separation cycle.
That energy is stored in the supercapacitor, which the researchers make by sandwiching a gel electrolyte between two biographene electrodes. Once the supercapacitor is charged up, it powers the pulse generator to fire the implanted electrode.
For practical use, the TENG wouldn’t be placed on delicate lung tissue, but attached to the inside of the rib cage, he says. The lungs would then press and release the device every time a person breathes in and out.
The researchers tested their system ex vivo for now, with the TENG placed on a model rib cage with actual pig lungs that were inflated and deflated using a pump, and the biosupercapacitor connected to electrodes that stimulated mouse brain tissue in a petri dish.
While commercial DBS systems electrically stimulate the brain continually, delivering 60 to 180 pulses per second, the new system is meant for intermittent DBS. Research has recently shown that intermittent stimulation might be more effective in conditions such as Alzheimer’s disease, memory, depression, and PTSD, Mosa says.
“Next we plan to do a long-term in vivo study,” he says.
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Note that any programming tips and code writing requires some knowledge of computer programming. Please, be careful if you do not know what you are doing…

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