Top 5 Cutting-Edge JavaScript Techniques
From monads to pattern matching, we walk you through the latest and greatest JavaScript techniques for advanced developers.
May 23rd, 2024 7:41am by
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Why Is JavaScript So Popular?
JavaScript has gained massive popularity due to its flexibility and has established itself as the world’s most widely used programming language. JS is often used to create dynamic web applications that feature a high level of interactivity — such as real-time updates, intuitive, feature-rich user interfaces, and much more. Furthermore, JavaScript allows applications to work across a range of platforms. JS can be used for an array of projects, such as powering e-commerce services or producing animations and mobile games. However, this is just a snapshot of the programming language’s capabilities. We’re also seeing JS being used in enterprise environments, especially during key ERP-powered processes like SAP staff augmentation, as it allows for the creation of custom dashboards and UI, built on top of the native web platform. Many leading platforms, like Facebook, use the open source user interface framework, React Native, which is built on JavaScript. This allows them to build mobile applications that work on both iOS and Android (and nowadays, even Apple Vision Pro) while using a single codebase. As a result, development times are significantly reduced, fewer resources are used, and the user experience is consistent across all platforms and devices. Server-side runtime environments like Node.js make it possible to run JavaScript outside of a web browser, further increasing the scalability and deployment possibilities of applications. To make JS even more universal and versatile, a large number of JS-compatible APIs also link web applications to external services. Finally, JavaScript is supported by a powerful ecosystem of libraries and frameworks that help simplify and speed up development, allowing developers to select pre-written code to perform specific functions.Top 5 Cutting Edge JavaScript Techniques
We have selected five cutting-edge JavaScript techniques that developers should be using right now, to help you overcome numerous development issues and create more effective, user-friendly applications.1. Monads (Asynchronous Operations)
Monads help to compose functions that require context in order to return a value and are very effective at simplifying error management and reducing the likelihood of unexpected results.Monads are all about making the composition of functions within code as simple as possible.They are commonly used when constructing enterprise-level applications that require the utmost accuracy. Monads can make code more manageable, resulting in complex callbacks, nested conditional branches, and so on. In essence, monads are all about making the composition of functions within code as simple as possible. Monads can be broken down into three types of function composition:
- Functions map: a => b
- Functors map with context: Functor(a) => Functor(b)
- Monads flatten (unwrap the value from the context) and map with context: Monad(Monad(a)) => Monad(b)
const composeM = chainMethod => (...ms) => (
ms.reduce((f, g) => x => g(x)[chainMethod](f))
);
const composePromises = composeM('then');
const label = 'API call composition';
// a => Promise(b)
const getUserById = id => id === 3 ?
Promise.resolve({ name: 'Kurt', role: 'Author' }) : undefined;
// b => Promise(c)
const hasPermission = ({ role }) => (
Promise.resolve(role === 'Author')
);
// Compose the functions (this works!)
const authUser = composePromises(hasPermission, getUserById);
authUser(3).then(trace(label)); // true
2. Declarative Programming
A declarative approach is often used when a developer prioritizes concise, expressive code.Declarative programming in JavaScript focuses on the overall goals of the code and not how these goals are achieved. This makes code much more simple and readable — therefore, making it easier to maintain. A declarative approach is often used when a developer prioritizes concise, expressive code to deliver projects quickly. Let’s compare a declarative approach to an imperative one: Imperative:
function evenSum(numbers) {
let result = 0;
for (let i = 0; i < numbers.length; i++) {
let number = numbers[i]
if (number % 2 === 0) {
result += number;
}
}
return result;
}
const evenSum = numbers => numbers
.filter(i => i % 2 === 0)
.reduce((a, b) => a + b)
3. Server-Side Caching for Improved Node.js Performance
Server-side caching could be used to automate the scaling of resources based on usage metrics.Caching is nothing new and may not be considered particularly cutting edge, but as both client-side and server-side web applications can use caching, it is a powerful tool for boosting performance. In particular, server-side caching can improve Node.js performance by speeding up data retrieval. Let’s take a look at a simple example of the memory-cache technique in use:
const cache = require('memory-cache');
function getDataFromCache(key) {
const cachedData = cache.get(key);
if (cachedData) {
return cachedData;
}
// If data is not in cache, fetch it from the source
const data = fetchDataFromSource();
// Store data in cache for future use
cache.put(key, data, 60000); // Cache for 60 seconds
return data;
}
4. Immutability
Immutability refers to something that cannot be changed. In JavaScript (and programming in general) it refers to a value that can never be changed after it has been set. As applications are constantly changed and updated, immutability may seem unnecessary — but this is not the case.This technique results in less debugging and fewer unexpected outcomes.Data that cannot be changed is important because it helps to enable consistency through the code base and helps with state management. Instead of changing a value, a new one is created, making things more predictable and thus reducing errors — like those that occur when a data structure unexpectedly changes. This results in less debugging and fewer unexpected outcomes. An example of immutability being used for name values:
// Import stylesheets
import './style.css';
// Write JavaScript code!
const appDiv = document.getElementById('app');
appDiv.innerHTML = `<h1>Open the console to see results</h1>`;
class Person {
//_name = "Nee";
//_name = ["Nee", "Ra"];
_name = { first: "Nee", middle: "L" };
get name() {
return this._name;
}
set name(value) {
console.log('In setter', value);
this._name = value;
}
}
let p = new Person();
//p.name = "Ra"; // Setter executes
//p.name.push("Lee"); // Setter doesn't execute
//p.name = [...p.name, "Lee"]; // Setter executes
//p.name.middle = "Lee"; // Setter doesn't execute
p.name = { ...p.name, middle: "Lee" }; // Setter executes
5. Pattern Matching
Pattern matching is a type of conditional branching that makes it possible to concisely match data structure patterns while binding variables simultaneously. Pattern matching is commonly used when writing XSLT stylesheets to transform XML documents.Pattern matching is much more effective than the standard switch statement.When it comes to testing a value against any given pattern, pattern matching is much more effective than the standard switch statement and provides much more control, allowing developers to write more complicated expressions. Here is an example of the factorial function being implemented with the match module, using the JUnify library:
match = function () {
var unify = unification.unify;
function match_aux(patterns, value) {
var i, result;
for (i = 0; i < patterns.length; i += 1) {
result = unify(patterns[i][0], value);
if (result) {
return patterns[i][1](result);
}
}
return undefined;
}
return function(patterns, value) {
return match_aux(patterns, value);
};
}();
var fact = function (n) {
return match([
[0, function() { return 1; }],
[$('n'), function(result) {
return result.n * fact(result.n - 1);
}]
], n);
};
Conclusion
JavaScript is flexible, multifunctional, and can be deployed on a range of platforms. Using the above techniques means developers can create powerful but concise code for their applications.
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