JS: Function Constructor

The Keyword: Function

The keyword Function (capital F) lets you construct a function from strings.

The advantage of using Function to define a function is that it lets you create function at run-time. Though, this is rarely needed.

Function(param1, param2, etc, body)

Return a function with specified params and body. The arguments should all be strings.

new Function (args)

same as Function (args)

Example

// function with no parameter
const ff = new Function("return 3;");
console.log(ff());
// 3

// function with 1 parameter
const gg = new Function("a", "return a;");
console.log(gg(4));
// 4

// function with 2 parameters
const hh = new Function("a", "b", "return a + b;");
console.log(hh(3, 4));
// 7