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 (…)
-
same as
Function (…)
Example:
const f = Function("a", "b", "return a + b;");
// function with no parameter const h1 = new Function ("return 3;"); console.log( h1() ); // 3
// function with 1 parameter const h2 = new Function("a", "return a;"); console.log(h2(4)); // 4
// function with 2 parameters const h3 = new Function("a", "b", "return a + b;"); console.log(h3(3,4)); // 7
Using new Function()
is similar to the use of eval(…)
, and you should be careful to not eval user generated input. Otherwise, it's a security risk.
JavaScript, Function
- JS: Define Function
- JS: Arrow Function
- JS: Function Parameters
- JS: arguments Object
- JS: Function Rest Parameters
- JS: Function Argument Default Value
- JS: Function Argument Destructure
- JS: Function Declaration vs Function Expression
- JS: Closure
- JS: Function Call, Apply, Bind
- JS: Functional Programing
- JS: Function Pipe 🚀
- JS: Function Object
- JS: Function Constructor
- JS: Function.prototype