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Abstract

const boundFn = fn.bind(this); Object.defineProperty(this, key, { value: boundFn, configurable: true, writable: true, }); return boundFn; }, }; }

class MyComponent { constructor(props) { this.props = props; } @autobind handleClick() { console.log(this.props); } }</pre></div>In this example, the decorator is used to decorate the function so that it automatically binds this when called and returns a new function. This way, after instantiating , you don’t need to manually bind this when calling the function.<code>autobindhandleClickMyComponentthis.handleClick()</code><h1 id="3ffe">Logging</h1>Decorators can be used to record logs, including printing information such as function calls, function execution times, etc.<div id="1a70"><pre>function log(target, name, descriptor) { const originalMethod = descriptor.value;

descriptor.value = function (...args) { console.log(Function ${name} called with ${args}); const start = performance.now(); const result = originalMethod.apply(this, args); const duration = performance.now() - start; console.log(Function ${name} completed in ${duration}ms); return result; }; return descriptor } class MyClass { @log myMethod(arg1, arg2) { return arg1 + arg2; } }

const obj = new MyClass(); obj.myMethod(1, 2); // Output: // Function myMethod called with 1,2 // Function myMethod completed in 0.013614237010165215ms</pre></div><h1 id="aff7">Authentication authentication</h1>Decorators can also be used to check a user’s authentication status and permissions to prevent unauthorized users from accessing sensitive data or performing actions on a regular basis.<div id="be1a"><pre>function authorization(target, name, descriptor) { const originalMethod = descriptor.value;

descriptor.value = function(...args) { if (!this.isAuthenticated()) { console.error('Access denied! Not authenticated'); return; } if (!this.hasAccessTo(name)) { console.error(Access denied! User does not have permission to ${name}); return; } return originalMethod.apply(this, args); }; return descriptor; }

class MyApi { isAuthenticated() { // perform authentication check return true; } hasAccessTo(endpoint) { // perform authorization check return true; } @authorization getUsers() { // return users data } @authorization deleteUser(id) { // delete user with id } }</pre></div><h1 id="646e">Cache</h1>Decorators can also be used to cache the execution results of functions to avoid double evaluation.<div id="5257"><pre>function memoize(target, name, descriptor) { const originalMethod = descriptor.value; const cache = new Map();

descriptor.value = function (...args) { const cacheKey = args.toString(); if (cache.has(cacheKey)) { console.log(cache hit: ${cacheKey}); return cache.get(cacheKey); } const result = originalMethod.apply(this, args); console.log(cache miss: ${cacheKey}); cache.set(cacheKey, result); return result; }; return descriptor; }

class

Options

MyMath { @memoize calculate(num) { console.log('calculate called'); return num * 2; } }

const math = new MyMath(); console.log(math.calculate(10)); // Output: // calculate called // cache miss: 10 // 20 console.log(math.calculate(10)); // Output: // cache hit: 10 // 20</pre></div><h1 id="57d9">Aspect-oriented programming</h1>Decorators can be used to implement facet-oriented programming, that is, to add functionality at runtime without modifying the original code.<div id="bc4d"><pre>function validate(target, name, descriptor) { const originalMethod = descriptor.value;

descriptor.value = function (...args) { const isValid = args.every(arg => typeof arg === 'string' && arg.length > 0); if (!isValid) { console.error('Invalid arguments'); return; } return originalMethod.apply(this, args); }; return descriptor; }

class MyForm { @validate submit(name, email, message) { // submit the form } }

const form = new MyForm(); form.submit('', '[email protected]', 'Hello world'); // Output: Invalid arguments</pre></div><h1 id="c8da">Reversible decorators</h1>Decorators can also be applied in reversible scenes, for example, you can add a reversible decorator to modify function behavior.<div id="b868"><pre>function reverse(target, name, descriptor) { const originalMethod = descriptor.value;

descriptor.value = function (...args) { args.reverse(); return originalMethod.apply(this, args); }; return descriptor; } class MyMath { @reverse calculate(num1, num2) { return num1 + num2; } }

const math = new MyMath(); console.log(math.calculate(1, 2)); // Output: 3 console.log(math.calculate.reversed(1, 2)); // Output: 3</pre></div><h1 id="2ddc">Automatic type checking</h1>Decorators can be applied to automatic type checking, for example, you can add a decorator to ensure that the type of a function parameter is correct.<div id="a63a"><pre>function checkType(expectedType) { return function(target, name, descriptor) { const originalMethod = descriptor.value;

descriptor.<span class="hljs-property">value</span> = <span class="hljs-keyword">function</span> (<span class="hljs-params">...args</span>) {
      <span class="hljs-keyword">const</span> invalidArgs = args.<span class="hljs-title function_">filter</span>(<span class="hljs-function"><span class="hljs-params">arg</span> =&gt;</span> <span class="hljs-keyword">typeof</span> arg !== expectedType);
      <span class="hljs-keyword">if</span> (invalidArgs.<span class="hljs-property">length</span> &gt; <span class="hljs-number">0</span>) {
        <span class="hljs-variable language_">console</span>.<span class="hljs-title function_">error</span>(<span class="hljs-string">`Invalid arguments: <span class="hljs-subst">${invalidArgs}</span>`</span>);
        <span class="hljs-keyword">return</span>;
      }
      <span class="hljs-keyword">return</span> originalMethod.<span class="hljs-title function_">apply</span>(<span class="hljs-variable language_">this</span>, args);
    };
    <span class="hljs-keyword">return</span> descriptor;
  }

}

class MyMath { @checkType('number') add(num1, num2) { return num1 + num2; } }

const math = new MyMath(); math.add(1, '2'); // Output: Invalid arguments: 2</pre></div>More content at <a href="https://plainenglish.io/">PlainEnglish.io</a>.Sign up for our <a href="http://newsletter.plainenglish.io/">free weekly newsletter</a>. Follow us on <a href="https://twitter.com/inPlainEngHQ">Twitter</a>, <a href="https://www.linkedin.com/company/inplainenglish/">LinkedIn</a>, <a href="https://www.youtube.com/channel/UCtipWUghju290NWcn8jhyAw">YouTube</a>, and <a href="https://discord.gg/GtDtUAvyhW">Discord</a>.Interested in scaling your software startup? Check out <a href="https://circuit.ooo?utm=publication-post-cta">Circuit</a>.</article></body>

Editor’s Choice — Top 10: If You Read Only One Story Today, Read One of These

All writers have to be voracious readers

Your mind learns finer details of writing if you pay attention while reading well-written stories. Great ideas cleverly presented by a good writer reach your subconscious mind in no time.

Preparing yesterday’s list, I learned from a story by Jason Ward that reading literally alters your brain and adds years to your life. After the end of curation, Dr Mehmet Yildiz, the Chief Editor and founder of Illumination, continuously inspires the editors to feature the work of our great writers.

When you are reading these stories, please understand that these stories are not to be skipped and skimmed. Every paragraph, every sentence, and every word in these stories has been chosen by the writer to present his or her unique point of view or perspective.

Now while I have you here ready to view my list, imagine Top 10 painted in red letters twelve feet tall.

Below are the ten best stories I read today. These are well worth your time if you are hoping to stay abreast of the best work on writing, self-improvement, books, and relationships:

10. 5 Questions To Consider When Taking Control of Your Life

John Teehan is a brilliant writer. He is inviting us to consider 5 questions to take control of our lives.

Are you satisfied or happy with your life right now? Are you really okay with things continuing as they are? Do you want more?

Sometimes we choose not to grow further because the answer is, yes, everything is pretty much as perfect as you’d like. It’s a rare satisfaction, but I’ve known more than one person who was just fine where they were in life and had no good reason to be anything or anyone else.

5 Questions To Consider When Taking Control of Your Life

Taking hold of life’s rudder and picking a direction.

medium.com

9. Seven Myths and Misconceptions About Your Brain

Simon Spichak is a neuroscience and science communicator. His masterpiece can help you separate myths from knowledge about your brain.

The brain is irrational, often relying on a set of cognitive rules as shortcuts. When oversaturated with data, it is particularly susceptible to misinformation. Worse yet, this misinformation can anchor our ideas of a specific topic, even influencing how we think about it when presented with new evidence. Did you grow up thinking that we swallowed eight spiders a year in our sleep? I did. This titillating tidbit about the world is downright false, but it hasn’t stopped the myth or variations of it from propagating through our culture. A writer in a magazine fabricated the spider swallowing fact to show how easily false information spreads.

Seven Myths and Misconceptions About Your Brain

Can you tell fact from fiction?

medium.com

8. The Invisible Father

Sonia Chauhan is the author of this fabulous short story about love and selfishness of lovers who leave and never return. No spoilers. Read it.

She often wondered whether time had stopped. Aeons had elapsed since she’d met him, or so it seemed to her. She tried not to think about the future, but that was all she could think of. As if to dampen her spirits further, he seemed rather aloof on phone calls. Could it be that he had found out the truth about his father? Or the circumstances of her departure from his father’s life.

The Invisible Father

A Short Story about, well…

medium.com

7. Cliches that Stick in Your Craw

Janice Arenofsky’s effort is worthy of a bookmark. Reread it when you forget to be original.

Don’t you just love it when someone pulls a cliche out of their pocket and applies it to something serious you just said? Did you say no? Well, I’m the same way. Cliches can be like puns — you feel like holding your nose or making an obscene noise when you hear them. You feel like saying, is that all you can come up with?

Cliches that Stick in Your Craw

My favorite clunkers

medium.com

6. The Spacebar Is the Secret to a Solid Relationship

Aurellia T. Elisha is trying to inspire you to figure out life with her. This 3-minute read says a lot. When she writes, she is on fire.

Most of us associate space with relationships as a bad sign. But we all have heard the advice that space in any relationship: platonic and romantic is healthy.

Regardless, we are still scared of it. We see couples taking a break and ended up separating. We see friends expanding their individual social circles and ended up breaking. It’s worse if it’s long-distance.

Space is like a spacebar. Once you master where to put space, your relationships will flourish.

The Spacebar Is the Secret to a Solid Relationship

How much space is enough space?

medium.com

5. So You Want to Be Happy

Amy Hartsough has written this masterpiece. Once you see her simple and elegant style, you would want to write like her.

I actually gave up on happiness several years ago. I just assumed that life is hard and that many people (including me) would never really be happy. I assumed it was normal to be unhappy.

I don’t feel that way anymore. Not even close. In the past few years, I’ve found a roadmap to happiness. In books.

So You Want to Be Happy

Insights on Happiness from 12 of My Favorite Books

medium.com

4. Running & Writing — The Mantra for Success Isn’t Too Different

The Maverick Files has written this wonderful piece that asks questions and explores possible answers to achieve success in writing.

This is the biggest reason why the first step towards any new skill or hobby is the hardest one to take.

Why should I even do this? Is there any benefit to doing this? Will I be good at it or am I even cut out to do this? Am I missing out on anything by not doing this? Why change?

Countless questions that have no real answers. The only answer is: If you never try, you will never find out.

Running & Writing —The Mantra for Success Isn’t Too Different

Because the human body and mind are designed to be trained

medium.com

3. Your Relationships Have An Energy Vibration

Tree Langdon’s masterpiece is a masterful execution of a feeling so complex that most of us quit before trying to put them into words.

When you create something new, pay attention to your intentions:

Whether it’s a new business or product or a new relationship, your energy will affect how your creation is viewed by others.

It’s not what you do, it’s how you do it.

Everyone’s soul has a unique energy vibration:

There are gifted people who can read soul records (called Akashic records). These records are energy imprints. Each one contains information about the unique gifts, energy vibrations, rhythms, talents, and abilities of that soul.

Your Relationships Have An Energy Vibration

So Does Everything You Create

medium.com

2. Why Stoic Philosophy is the Secret Ingredient for Happiness During the Holidays

Sebastian Purcell, PhD explains Stoic practices and activities to enjoy the coming holidays.

Thanksgiving is a time for gratitude and indulgence — as are most other holidays. What Stoicism offers us is a toolbox to do these activities well.

In this piece, my practical purpose is to explain the top four Stoic “spiritual exercises” to help you along.

My philosophical purpose is to show that even professionals have missed these Stoic practices for indulgence because they haven’t recognized the way in which good company is crucial for our best pleasures.

Why Stoic Philosophy is the Secret Ingredient for Happiness During the Holidays

4 Spiritual Exercises in Gratitude and Indulgence

medium.com

1. 3 Underrated Habits That Can Help You Get More Done in a Day Than Most People Do in a Week

At number one, Thomas Oppong is telling us about getting more done in the smartest way possible.

Your time is limited and precious.

If you want to get more things done, do your best work every day and crush your work and life goals, you have to make time for habits that may seem like lazy but actually help you get more work done.

Everyone aspires to get things done in the fastest, smartest ways possible. No one wants to waste time on low-value tasks.

3 Underrated Habits That Can Help You Get More Done in a Day Than Most People Do in a Week

It pays to completely clear your mind and begin again

medium.com

Final Thoughts

No matter how hard I try, it’s impossible for me to read everything all of you publish on Illumination and Illumination-Curated.

If you are an editor, writer, or reader of Illumination and if you have read a story that you liked, drop its link in the comments below. If you want to write a few lines as a review of the story, it would help me even more. I’ll publish the short review with your name.

I would love to include the stories — and your short reviews — in my top 10 stories tomorrow.

To become a better writer, and increase the chances of getting selected for further distribution, read these guidelines:

Curation Guidelines for Illumination Writers — In Simple Words

A step-by-step guide to become a better writer

medium.com

You can read my curated stories here.