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Abstract

er">17]</pre></div><blockquote id="c020">Compact Map()</blockquote><code>compactMap</code> function is similar to <code>map</code>, but it also includes an additional step, it filters out any <code>nil</code> values that result from applying the transformation closure. This is particularly useful when you have an array of optional values and you want to transform them while simultaneously filtering out the <code>nil</code> elements.<div id="9cf9"><pre>extension Array { func compactMap<T>(_ transforms: (Element) -> T?) -> [T] { var result = T for element in self { if let element = element { result.append(transform(element)) } } return result } }</pre></div>Here the only change from <code>Map</code> and <code>Compact Map</code> is avoiding the nil value with a condition.In the above code<ul><li>It takes a closure <code>transform</code> as an argument, which specifies how each element should be transformed.</li><li>Inside <code>compactMap</code>, a new array <code>result</code> is created to store the transformed non-nil elements.</li><li>It then iterates over each element of the original array (<code>self</code>), applies the transformation closure to each element, and checks if the result is non-nil.</li><li>If the result is non-nil, it appends the transformed element to the <code>result</code> array.</li><li>Finally, it returns the <code>result</code> array containing all the non-nil transformed elements.</li></ul><blockquote id="9909">How to consume it?</blockquote><div id="41f1"><pre>let mapArray = [23, 43, 56, nil, 75, 9, 14] let result= mapArray.compactMap { $0 } debugPrint(result) output: [23, 43, 56, 75, 9, 14]</pre></div><blockquote id="854c">Flat Map()</blockquote>FlatMap is typically the same as <code>map</code> does, only difference is that it always return flatten array joining all elements. Typically used to collect specific data in n

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ested array, dictionary or set<div id="6431"><pre>extension Array { func flatMap<T>(_ transform: (Element) -> [T]) -> [T] { var result = T for element in self { result.append(contentsOf: transform(element)) } return result } }</pre></div>In the above code<ul><li>It takes a closure <code>transform</code> as an argument, which specifies how each element should be transformed into a sequence.</li><li>Inside <code>flatMap</code>, a new array <code>result</code> is created to store the flattened elements.</li><li>It then iterates over each element of the original array (<code>self</code>), applies the transformation closure to each element, and concatenates the resulting sequences into the <code>result</code> array.</li><li><code>append(contentsOf: )</code> will add the elements of a sequence to the end of the array.</li><li>Finally, it returns the <code>result</code> array containing all the flattened elements.</li></ul><blockquote id="2285">How to consume it?</blockquote><div id="117f"><pre>let arrayOfArrays = [[1, 2, 3], [4, 5, 6], [7, 8, 9]] let transformedArray = arrayOfArrays.flatMap { $0 } print(transformedArray) output: [1, 2, 3, 4, 5, 6, 7, 8, 9]</pre></div><h1 id="3bda">Conclusion</h1>There are plenty of other use cases for higher-order functions. This is a gist of what we have discovered today:<ul><li>If you need to simply transform a value to another value, then use <code>map</code>.</li><li>If you need to remove nil values, then use <code>compactMap</code>.</li><li>If you need to flatten your result one level down, then use <code>flatMap</code>.</li></ul>Thank you for your time and attention! 👏👏👏Do clap👏 if you like this and comment your suggestions!!! Happy coding!!!<blockquote id="1e0c">Source Code: <a href="https://github.com/Vikassingamsetty/HigherOrderFunctions.git">GitHub</a></blockquote></article></body>

Plans For the Coming Year

Resolutions

I used to worry that I wasn’t keeping on top of things. It got worse this last year as I began to read more here at Medium and discovered there was a whole new world of words that I didn’t know. I mean, there were a lot of them. For a time, I wondered where the hell I had been that I didn’t know how to speak English anymore. So, I would often have two windows open in my browser, the Medium story I was reading and Google, where I would type things like “What does Ghosting mean?” I mean, I’m a psychic. I talk to dead people all the time. I sure as hell ought to know what Ghosting means.

I did, though, manage to learn how to answer my cell phone this year. Previously I would stab my finger repeatedly at the little green telephone handpiece, and nothing would happen. My husband then explained to me that I had to swipe with my finger rather than stab franticly, and there would be somebody on the other end to talk to. This year I hope he will help me to learn how to hang up. I thought it was when you said, “Goodbye”. Sometimes that seems to work, and other times it does not. So, still a little confused about that one.

I’ve got a few things this year that I would like to do. I’d like to learn more German and Spanish. I’m not pushing for French this year because I might get them all twisted around together. Since the German and Spanish I have right now are all twisted together already, I figured why not learn them both at the same time? It’s an experiment. Que sera, sera.

I’d like to get another sourdough going and make some good crusty artisan bread. I don’t know how many sourdough starters I’ve had over the years that have died. Turns out they might have just turned into hootch. Tell me, when something smells like somebody’s feet, don’t you figure something somewhere did not turn out right? However, enough people have told me just to mix it down, feed it some flour and set it out on the counter to make me think. maybe I buried them too soon. I can try that again.

Something new I’d like to try is to start publishing books. It’s been a dream of mine for many years and even after having tried publishing houses for a good year and a half once a very long time ago and getting one rejection letter after another, I want to try this again. This time, however, I don’t have time to do it the old-fashioned way. I’m just going to self-publish on Amazon. I wrote one book last year that got chopped up into three in a series. I’ll polish them up, look for an editor, figure out what sort of covers I want, and self-publish.

Then, something I’ve never done before, I want to try my hand at narrating those books. Wouldn’t that be a hoot? I’ve already got my first piece of recording equipment. I bought a dog clicker. Evidently, you use that when you make a mistake, or cough, or fart, or make some other odd noise. When you are editing, you evidently can listen better for the clicker than you can for some downwind fart noise.

Another thing that should happen this year is to get my author’s website up and going. I’ve had the domain name, actually, two of them for a year. One is PaulineEvanosky.com, and the other is Pauline-Evanosky.com. I just can’t remember how to do WordPress, so I have to relearn that one.

I wrote a book about how to learn to be a psychic channel a while back. It needs to be finished up, and I might even be able to tease that into two books. I’ll see.

I should clean up my study. I’ve been saying that for the last four or five years. Maybe…maybe not.

These won’t be my only plans for the coming year. Just some of them. Others will occur to me as time goes by.

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