Functional Programming programming Software Development Technology
Haider.
Haider.

@slow_developer

16 tweets 9 reads Apr 18, 2023
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JavaScript higher-order functions are indispensable in enabling the manipulation and processing of collections of data.
How exactly do they work?
Unlock the power of higher-order functions in JavaScript to write faster and more efficient code.
JavaScript higher-order functions are indispensable in enabling the manipulation and processing of c...
Higher-order functions are functions that take other functions as arguments, or return functions as their results. They are an important concept in functional programming and allow for more reusable and modular code. It can be used to implement many powerful programming patterns.
1. Using Functions as Arguments
One common use case for higher-order functions is to pass a function as an argument to another function. This allows the caller to customize the behavior of the function being called.
In this example, `applyOperation()` is a higher-order function that takes two numbers `x` and `y`, and a callback function `operation` as arguments. The `operation` function is called with `x` and `y` as its arguments, and its result is returned.
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In this example, `applyOperation()` is a higher-order function that takes two numbers `x` and `y`, a...
The `add()` and `subtract()` functions are passed as `operation` to `applyOperation()` to perform addition and subtraction, respectively.
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2. Using Functions as Return Values
Another use case for higher-order functions is to return a function as its result. This allows the caller to create a new function with a customized behavior.
In this example, `createMultiplier()` is a higher-order function that takes a `factor` as its argument and returns a new function that multiplies its argument by a `factor`.
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In this example, `createMultiplier()` is a higher-order function that takes a `factor` as its argume...
The returned function can be assigned to a variable and used to create new functions with customized behaviors.
The `double()` and `triple()` functions are created using `createMultiplier()` with factors of 2 and 3 respectively.
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3. Using Functions to Filter Arrays
Higher-order functions can also be used to filter arrays based on a condition. The `Array.prototype.filter()` method is a built-in higher-order function that filters an array based on a callback function that returns a boolean value.
In this example, the `filter()` method is called on the `numbers` array with a callback function that takes each element of the array as its argument and returns `true if element is even, and `false` otherwise.
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In this example, the `filter()` method is called on the `numbers` array with a callback function tha...
The resulting array contains only the even numbers from the original array.
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4. Using Functions to Map Arrays
Another built-in higher-order function is the `Array.prototype.map()` method, which transforms an array by applying a function to each element and returning a new array with the transformed elements.
Array.prototype.map

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In this example, the `map()` method is called on the `numbers` array with a callback function that takes each element of the array as its argument and returns the square of the element. The resulting array contains.
In this example, the `map()` method is called on the `numbers` array with a callback function that t...
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