JS Practice — Built-in Objects

Function.length — typeof

📖 Usage Example

function fn(a, b, c, d = 0) {}
fn.length  // → 3

Only parameters before the first default are counted in length.

typeof fn.length

fn.length is always a number. typeof ((a) => {}).length returns 'number'.

Challenge: Verify that typeof ((a) => {}).length returns 'number'.

💡 Hints (1)