Практика Shadowing: Array Map in 100 Seconds - Изучайте разговорный английский по видео
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ArrayMap.
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Create a new array by calling a function on every element in a different array.
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Imagine we have an array of squares.
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We can call a function on every single one of those
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squares using map to convert it to a new array of circles.
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In other words, it's just a loop, where the goal of that loop is to create a new array.
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In our code, let's start with an array of objects that contain some user data.
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Our goal is to take this array of objects
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and convert it to an array of strings that only contain the user names.
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You could do this imperatively by creating a new empty array, then use a for loop to push each individual username to the new array.
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Notice how we're using statements to change the app's state.
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This is known as imperative programming.
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Map on the other hand is declarative and describes how to create this new array using a function.
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The new array is equal to the original array mapped to a function.
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The function is passed as an argument to map, and it's called on every element in the original array.
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The function has access to the current element in the loop as well as its index.
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In the body of the function, your job is to compute a new value and then return it.
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And we've now solved the same problem we did with the for loop, but with less code and without mutating the internal state.
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If you're a ReactJS user, you'll often see Map used to take some initial data and then map it to JSX for the actual UI.
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Or maybe you need these usernames to do something asynchronously like fetch additional data from the database.
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You could do that by mapping them all to an array of promises, then running them concurrently with promise.all.
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One anti-pattern to be aware of with map is
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that you should only use it if you plan on using the new array.
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If you just need to run a loop, consider for each, or a regular for loop instead.
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This has been ArrayMap in 100 seconds, thanks for watching, and I will see you in the next one.
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Об этом уроке
Вы практикуете английский с "Array Map in 100 Seconds" с помощью техники Shadowing — метода, разработанного для подготовки профессиональных переводчиков.
Слушайте каждое предложение, обращайте внимание на ударения и связывание звуков, затем повторяйте вслух уверенно. 15–30 минут ежедневной практики дадут заметные результаты.
Что такое техника Shadowing?
Shadowing — это научно обоснованная техника изучения языка, изначально разработанная для подготовки профессиональных переводчиков и популяризированная полиглотом доктором Александром Аргуэльесом. Метод прост, но эффективен: вы слушаете аудио на английском от носителей языка и немедленно повторяете вслух — как тень, следующая за говорящим с задержкой в 1–2 секунды. В отличие от пассивного прослушивания или грамматических упражнений, Shadowing заставляет мозг и мышцы рта одновременно обрабатывать и воспроизводить реальные речевые паттерны. Исследования показывают, что это значительно улучшает точность произношения, интонацию, ритм, связную речь, понимание на слух и беглость речи — что делает его одним из самых эффективных методов для подготовки к IELTS Speaking и реального общения на английском.