Shadowing Practice: What are Design Patterns? | Introduction to Design Patterns and Principles | Geekific - Learn English Speaking with Video
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What's up geeks and welcome to the channel! If you're in the computer science domain you definitely have heard of design patterns before or even used a few patterns in practice with or without your knowledge but really what are design patterns?
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why were they created in the first place and who decided to create them?
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what is actually the main purpose behind design patterns?
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all these questions and more will be answered in this first video of our design pattern series to which later we will add more videos detailing each pattern on its own.
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As always and to better understand the concept at hand let's take a practical example and let's imagine a steak. You see I may have imagined a well done steak you may have imagined a medium done one someone else might have imagined a vegan steak, while ordering a steak at a restaurant, each one of us orders it differently we don't all necessarily have to order or eat our steak the same way and yet the cook that is preparing it, will take the same piece of meat or soy in addition to the way or policy of how we like our steak and prepare a delicious meal a different one for each one of us using the same piece of meat as a starting point To compare this to a computer program suppose we have a Chef class with a prepare() method This method can take a WellDoneInstruction object and in this prepare method the chef will know how to prepare a well-done steak but what about other ways of preparing a steak we will have to overload this method to take in a MediumDoneInstruction and a VeganInstruction Okay now our chef knows how to cook all the steaks we want Let's say this chef extended his knowledge and now knows of five additional ways to cook a steak should we add five more methods? Well let me suggest something else, why not replace all these methods with a single method that takes a steak cooking instruction and let all these classes inherit this one what do you think?
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Isn't that a better design for our Chef class You see this way, our class is closed for modification and open for extension which means that not only we won't have to add any more methods nor even touch our Chef class in the future but in addition to this when a new instruction is needed all we have to do is extend the SteakCookingInstruction class we created with this new instruction and the prepare method will handle it automatically Now because of our design, this chef apparently skyrocketed and decided to open a new branch for the restaurant So every time a new customer enters the restaurant the chef goes ahead and informs them of the opening date and details for the new branch but do you think that is the best approach to deal with such a scenario?
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Don't you think that instead of waiting for people to come in the chef should have instead messaged all his customers the details about the opening or even posted on social media and those interested would have showed up wouldn't his reach be far larger? In both previous scenarios the solutions I suggested hint at a specific pattern this pattern will not actually solve our problem and generate magically ready code for us but rather it will give us a description or template to follow a way of thinking that will help us solve these problems like a series of formalized best practices, steps that programmers have followed and used to solve common problems like the one we just encountered. Design Patterns best became known from the design patterns book by Erich Gamma, Richard Helm, Ralph Johnson, and John Vlissides often referred to as the Gang of Four book published in the mid 90s.
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Now, this book details 23 design patterns which were split into three groups: Creational Patterns, Structural Patterns, and Behavioral Patterns.
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Creational patterns deal with the creation of objects Instead of you instantiating all objects very specifically and explicitly they give you more flexibility in how the objects are actually created Let's suppose that we have a class with 10 attributes but not every time we create an object based on this class we need to specify all 10 attributes sometimes you only need one, in other cases three or two, and sometimes eight or nine, in such cases we are left with two solutions and not quite the best out there: either to create a lot, like a lot, of overloaded constructors for our class or create one constructor that takes all arguments but then we will need to pass as null values the ones we don't require upon creation of our objects Well, design patterns will tell you wait, you have a third option follow the template provided by the Builder Pattern, a template widely used and tested by many developers out there Well if I were in your shoes I'd pick this last option.
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Structural patterns deal with how classes are actually designed with how things like inheritance and composition and aggregation can be used to provide extra functionality Let's consider that in our application we are storing book objects and these books well there's too many of them, like in the hundred thousand books of a library, or the books in all of amazon online store, and for some reason we need to represent each book by an object You see in this case we will have a bunch of book objects that will share the same attributes and by bunch I mean in the thousands which will have the same author, the same amazon physical storage location, same places it can be delivered to, same provider, etc. you got the idea and maybe the only attribute that will defer is the title itself and the price in some cases So why create for each book an object and consume all this amount of memory while at the same time if we follow the template specified by the Flyweight Pattern we will be able to minimize memory usage by sharing as much data as possible between our similar objects You see that is what design patterns are trying to do they are trying to provide us with a schema, a step-by-step definition or template to help us overcome development or architectural problems that others have faced before us.
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Finally, Behavioral patterns are specifically concerned with communication and assignment of responsibilities between objects as the program is running The two examples we gave at the beginning of our video can actually be solved using two different behavioral patterns one of them being the Strategy pattern Let's take a second example and suppose we realized that the state of an object in our application will be changed by a lot of other objects but we need to be able to undo the last change Well this can be done in many different ways and you are free to use any of them but there is a Memento design pattern that describes a simple proven approach. So to sum up, design patterns will speed up your development process by providing tested and proven development models At first you may not notice that you require the use of this pattern here or there or you may make use of it without even knowing but with time practice and hopefully with the help of our videos you will! So that's it for this video, I hope it was helpful, thank you guys for watching, take care and I will see you in the next one!
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Vocabulary and speaking notes for this lesson
This C1 speaking lesson is built on the video “What are Design Patterns?”. The speaker keeps coming back to these words: pattern, object, design, steak, chef. This video has 11 sentences and 1284 words to shadow. The speech runs for 7:17. The speaker talks at a natural 176 words per minute, close to everyday conversation. 85% of the words are among the 3,000 most common in English; the rest is worth studying before you start. 7 of its 11 sentences are questions, so it is good practice for question intonation and short answers.
Key vocabulary in this video
The 15 most advanced words in the video, with pronunciation and meaning:
| Word | Pronunciation | Meaning |
|---|---|---|
| steak noun | /steɪk/ | Beefsteak: a slice of beef, broiled or cut for broiling. |
| template noun | /ˈtɛm.plɪt/ | A physical object whose shape is used as a guide to make other objects. |
| attribute noun | /ˈæt.ɹɪˌbjut/ | A characteristic or quality of a thing. |
| behavioral adjective | /bɪˈheɪvjəɹəl/ | Of or relating to behavior. |
| overload verb | /ˌəʊvəˈləʊd/ | To load excessively. |
| specify verb | /ˈspɛs.əˌfaɪ/ | To state explicitly, or in detail, or as a condition. |
| aggregation noun | /æɡɹəˈɡeɪʃən/ | The act of collecting together, of aggregating. |
| constructor noun | /kənˈstɹʌktɚ/ | A person who, or thing that, constructs. |
| formalize verb | /ˈfɔɹ.məlaɪːz/ | To give something a definite form; to shape. |
| instantiate verb | /ɪnˈstænʃieɪt/ | To represent (a concept, theme, or principle) by an instance. |
| magically adverb | /ˈmæd͡ʒ.ɪ.kli/ | In a magical manner; by magic, or as if by magic. |
| schema noun | /ˈskiːmə/ | An outline or image universally applicable to a general conception, under which it is likely to be presented to the mind (for example, a body schema). |
| skyrocket verb | /ˈskaɪˌɹɒk.ɪt/ | To rise or increase suddenly and extremely; to shoot up; to surge or spike. |
| inherit verb | /ɪnˈhɛɹɪt/ | To receive (property, a title, etc.), by legal succession or bequest, usually after the previous owner's death. |
| programmer noun | /ˈpɹoʊɡɹæmɚ/ | One who writes computer programs. |
Phrasal verbs you will hear
| Word | Pronunciation | Meaning |
|---|---|---|
| go ahead verb | /ˌɡoʊ əˈhɛd/ | To proceed with; to begin. |
| show up verb | To appear, arrive, or attend, especially suddenly or erratically. | |
| speed up verb | /spiːdˈʌp/ | To accelerate; to increase speed. |
| sum up verb | To produce a total by adding. |
דקדוק בסרטון הזה
המבנים שהדובר משתמש בהם הכי הרבה, עם המילים המדויקות מהסרטון:
| מבנה | בסרטון |
|---|---|
| משפטי תנאי (Conditional sentences) if + clause, will/would + verb — תנאי ותוצאה שלו | if I were in your shoes I'd pick |
| סביל (Passive voice) be + past participle — הדגש הוא על מה שקורה, לא על מי שעושה את הפעולה | will be answered · is closed · were split |
| הווה מושלם (Present perfect) have/has + past participle — פעולה שקרתה בעבר ועדיין יש לה חשיבות או השפעה עכשיו | have heard · have followed · have faced |
| משפטי זיקה (Relative clauses) who / which + clause — מידע נוסף על אדם או דבר | extension which means · patterns which were · thousands which will |
Pronunciation to watch
The speaker uses 8 contractions and reduced forms, such as don't, I'd, isn't. Say them the short way, as you hear them.
- The “sh” and “zh” sounds: aggregation /æɡɹəˈɡeɪʃən/, instantiate /ɪnˈstænʃieɪt/, modification /ˌmɑdɪfɪˈkeɪʃən/
- Long words — get the stress right: behavioral /bɪˈheɪvjəɹəl/, aggregation /æɡɹəˈɡeɪʃən/, modification /ˌmɑdɪfɪˈkeɪʃən/, inheritance /ɪnˈhɛɹɪtəns/, architectural /ˌɑɹkɪˈtɛkt͡ʃəɹəl/
How to practise with this video
- Listen to the whole video once without speaking and note the words you do not know.
- Start at 0.75× speed, shadow it sentence by sentence, then go back to normal speed once it feels easy.
- Record yourself and compare with the original, paying attention to words like steak, template, attribute.
מהי טכניקת השאדואינג?
שאדואינג היא טכניקת למידת שפה מבוססת מדע שפותחה במקור להכשרת מתורגמנים מקצועיים ופופולרית על ידי הפוליגלוט ד"ר אלכסנדר ארגואלס. השיטה פשוטה אך עוצמתית: אתה מקשיב לאודיו באנגלית ילידית וחוזר עליו בקול רם מיד — כמו צל העוקב אחרי הדובר עם עיכוב של 1–2 שניות בלבד. בניגוד להאזנה פסיבית או תרגילי דקדוק, שאדואינג מכריח את המוח והשרירים בפה לעבד ולשחזר דפוסי דיבור אמיתיים בו זמנית. מחקרים מראים שזה משפר משמעותית את דיוק ההגייה, האינטונציה, הקצב, הדיבור המחובר, הבנת השמיעה ושטף הדיבור — מה שהופך אותו לאחת השיטות היעילות ביותר להכנה לIELTS Speaking ולתקשורת באנגלית בעולם האמיתי.