Cannot assign to a function result

You attempted to assign a value to a function result. The result of a function can be assigned to a variable, but it cannot be used as a variable. If you want to assign a new value to the function itself, omit the parentheses (the function call operator). The following example demonstrates a situation in which this error is generated.

myFunction() = 42;  // Attempting to assign the value 42 to the result of the function call.  

To correct this error

• Do not use the value of a function call result as something you can assign to. You can assign the result of the function call to a variable though.

  myVar = myFunction(42);  
  

• Alternatively, you can assign the function itself (and not its return value) to a variable.

  myFunction = new Function("return 42;");  
  

See also

Function Object
Writing JavaScript Code
Functions