"new Function"

. .

:

let func = new Function ([arg1, arg2, ...argN], functionBody);

arg1...argN functionBody .

. :

let sum = new Function('a', 'b', 'return a + b');

alert( sum(1, 2) ); // 3

:

let sayHi = new Function('alert("")');

sayHi(); // 

() .

.

new Function . :

let str = ...          ...

let func = new Function(str);
func();

.

[[Environment]] . (lexical environment) ( ).

new Function [[Environment]] .

.

function getFunc() {
  let value = "";

  let func = new Function('alert(value)');

  return func;
}

getFunc()(); // error: value is not defined

:

function getFunc() {
  let value = "";

  let func = function() { alert(value); };

  return func;
}

getFunc()(); // "test",     getFunc

new Function .

. ( ) . .

.

minifier . .

let userName (minifier) let a ( ) . . . . .

new Function userName .

new Function , .

.

new Function .

:

let func = new Function ([arg1, arg2, ...argN], functionBody);

.

:

new Function('a', 'b', 'return a + b'); //  
new Function('a,b', 'return a + b'); //    
new Function('a , b', 'return a + b'); //     -    

new Function [[Environment]] . . .