Higher-Order Functions

01 How It Works

Think of a factory machine tool attachment that can be fitted with different modular operational heads.

Treating functions as first-class citizens allows powerful functional programming abstractions.

function multiplier(factor) {
  return x => x * factor;
}
const double = multiplier(2);
console.log(double(5)); // 10

1. 1. Create a function that accepts a function argument or returns a function.

2. 2. Invoke or return the inner function behavior dynamically.

3. 3. Build composable functional layers.

02 Practical Example

Here is how you might see this concept applied in real-world code:

const numbers = [1, 2, 3];
const mapped = numbers.map(n => n * 10);

Related Concepts

• Callback Functions
• Pure Functions