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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>

My Isolation Has Caused An Emotional Jailbreak

If you’re like me, there have probably been some emotional side effects of self-isolation. Trigger warning: emotionally sensitive content.

I like to write light-hearted, helpful articles.

Anyone who reads my stories knows I love listicles. I even wrote a listicle about why I love listicles. But today I’m going to write something a little more serious, something personal and painful.

I’m going to share my darker side because, nobody’s life is all sunshine and lollypops, sometimes you have to walk through the forest to get to the waterfall.

Top 5 Reasons Why I Love Listicles

I know I’m not supposed to, but I just can’t help myself.

medium.com

You might be walking through a forest of your own these days. You are not alone.

If you’re like me, there have probably been some emotional side effects of self-isolation.

I recently wrote an article about Karma coming home to roost. How the life decisions we’ve made are highlighted and exacerbated when we are forced to confront our home lives without distraction.

But there’s something else that happens as well. Something I’m experiencing. It’s the triggering that can occur in this kind of situation.

I have a home daycare, and it no longer makes sense to have five little tiny droolers coming from five different homes into mine every day. I am especially at risk because I’ve had open-heart surgery. Although I am very healthy now, the plastic valve in my heart always puts me at risk when there is an illness going around.

My doctor and I decided it would be prudent to close. So now I’m home, without distraction and without income.

Our Canadian government has put measures in place, but it’s not totally clear if I will qualify. My husband is still working, so I’m thankful for that. I will eventually re-open.

I’ve rebuilt my life many times, this will be no different. My husband and I are expert survivers.

But somehow, the loss of income plus the eerie silence in my home and neighborhood has messed with my head. It’s stirred up some demons that I’d thought were long dead.

It makes me wonder how many thousands or millions of others are going through this right now.

For me, it’s making me feel vulnerable in a way I haven’t felt since childhood.

When I was about four or five, I had a traumatic experience. I repressed the memories, so I didn’t know about it until I was in my 20’s when some of them emerged in therapy.

Until then, I’d just lived with a generalized sense of anxiety and dread.

When I uncovered the memories, I chose not to recover them all. I knew the event, I remembered everything leading up to and after it. I had to stop in the process of remembering because it was too much.

I told my therapist that I knew enough, and I didn’t want to remember the actual event because it felt like it might kill me. She understood, and we decided to work on it from the place where I felt comfortable.

I thought I’d taken care of those feelings because my life moved on. I stopped destroying myself and even managed to find love. I assumed I’d resolved everything in therapy.

It seems they’d been waiting at the bottom of the well for the right bucket to grab them and bring them back up. This pandemic, it seems, is that bucket.

In my teen years, these repressed memories morphed into an overwhelming, irrational terror of nuclear war.

I remember never being able to fall asleep. I’d lie in my bed, eyes wide open, for hours just waiting for the bombs to drop. The film they showed us in high school, the one about hiding under a desk in case of a strike, traumatized me further.

The fact that I was chronically depressed, and there was no comfort for me at home exacerbated my condition.

I was the scapegoated black sheep of my family. My parents had already given up on me by then. There was nothing but indifferent adults and an older sister who bullied me daily to help me navigate those teenage years.

The pandemic has opened a direct channel to those feelings. I find myself once again parenting my inner child, treading desperately to avoid being swallowed up by memories and emotions.

Even as I write this, my anxiety is rising to levels I haven’t experienced in years, and I’m feeling just like it did when I was a child.

I no longer drink. I used to get by drinking these feelings away. I spent about 20 years soaking myself in alcohol as I labored through therapy.

I was able to break free from self-medicating but was still a heavy social drinker until about two years ago when my body stopped tolerating it. So even if I wanted to start drinking again, I couldn’t. With a teenager in the house, it would set a bad example anyway.

It doesn’t’ help that I have a 13-year-old daughter here with me. Although she is a good kid who I genuinely enjoy, simply being with her is also triggering me.

She is the exact age that I was when my life started falling apart. I lost my virginity at the ripe old age of 13 (one month after my birthday) to an 18-year-old who wanted to see what it was like to fuck a virgin.

He then proceeded to tell everyone in the music store we both hung around in all about it after promptly breaking up with me.

The humiliation and shame I felt when I found out he not only told everyone but laughed about it, compounded my vulnerability. It never occurred that because I was so young, I could have had him charged with rape. I could have exacted the type of revenge that would follow him for life. I wish I could time travel.

That place was my only refuge. I spent every Saturday hanging out there pretending to be a musician and talking to the one person who ever bothered with me — the manager who must have felt sorry for me and let me hang around with him for hours.

He was the one person in my teenage life who showed me any mercy and was kind to me without wanting anything back.

Those teenage years were so bad and dark and terrible that just thinking about them to write about it is bringing me to tears. I was so alone and struggling.

My older sister became particularly vicious in our teens and took out every problem she had on me. I lived as an emotional punching bag and scapegoat for my entire family. A role I could never escape.

So my daughter, through no fault of her own, has become the embodiment of all of that trauma.

I am struggling to see her for what she is while we are confined together. It takes such an effort to stay in the present and not slip back in the darkness as we make our way through this.

I don’t want to project any of this onto her. But with no distractions, it is hard to tell where those lines are drawn.

I am usually able to keep these demons wrapped up safely in a part of my psyche that has secure locks on the doors. But this isolation has slipped a key through the bars, and one by one, they seem to be escaping.

Not having my grown-up job to keep me grounded in who I am and all of the distractions of modern life to keep my mind occupied has caused a bit of an emotional jailbreak.

Now it’s time for me to take my own advice.

5 Easy things you can do today to stop procrastinating

When it comes to procrastination, nobody is immune.

medium.com

I need to do some work, I need to face these issues. I need to do some self-help to get myself grounded.

I will do some writing, some EFT, get some exercise, and remind myself that I am more than just my trauma. The past is behind me, the future is ahead, and all I have is today.

Today I will give my daughter all of the love I can, and as I try to ground her in the present I will give her what I never had. Love, security, and stability in the face of adversity.

I’m going to be the parent I never had. I’m going to parent myself as I parent her and find my strength so we can all get through this a little better, a little stronger, and a little healthier.

I hope you can too.

If you’d like to read more articles that uplift and enlighten, join us here on ILLUMINATION. Why not write for us? Bring your talent, courage, and insight. Share your story and let’s do something great!

Thanks for reading! If you found that helpful, you may also like these:

Instant Karma Brought To You By Covid-19

This is an exercise in truth for all of us.

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Simple Gestures That Make People Feel Special— And The Best Thing Is They’re Free

It doesn’t cost money to show someone you care.

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Every day you have the power to make the world better, worse or leave it the same.

You’re going to get home at the same time anyway, what path will you take.

medium.com