Use Array.flat() to Flatten Nested Arrays

Problem

Flattening nested arrays requires recursive functions or complex reduce logic.

Solution

Use Array.flat(depth) to flatten arrays to specified depth in one line.

Benefit

Eliminates 20+ lines of recursive flattening code.

Code Example

const nested = [1, [2, 3], [4, [5, 6]]];

// Flatten one level
const flat1 = nested.flat(); // [1, 2, 3, 4, [5, 6]]

// Flatten all levels
const flat2 = nested.flat(Infinity); // [1, 2, 3, 4, 5, 6]