What is a javascript function constructor?

[amurleopard]

Function Constructor.

A function can be defined using the function keyword or using a built-in Javascript function constructor, called Function( )

A normal function declaration. Here the function is called "hello"

function hello() {
  console.log('Hello world');
}
hello();

A function using the function constructor.

let myNumber = new Function("a", "b", "return a * b");

let sum = myNumber(4, 3);
console.log(sum)