Currying & Higher-Order FunctionsIntermediate
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javascriptWhat is currying and how do higher-order functions enable functional composition?
Explanation & Concept
A Higher-Order Function is a function that takes one or more functions as arguments, returns a function, or both.
**Currying** is the functional technique of translating a function with multiple arguments into a sequence of unary functions (functions taking one argument each). Currying enables **Partial Application**, where you pre-configure common arguments to create specialized reusable functions.
Code Example
javascript
// Standard function: add(a, b)
// Curried function: a => b => a + b
const multiply = (a) => (b) => a * b;
// Create specialized utility functions
const double = multiply(2);
const triple = multiply(3);
console.log(double(10)); // 20
console.log(triple(10)); // 30
// Useful in array transformations
const numbers = [1, 2, 3, 4];
console.log(numbers.map(double)); // [2, 4, 6, 8]How It Works & Key Takeaways
Currying breaks complex operations into modular pipelines, allowing configuration to be supplied upfront and applied repeatedly.
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