Question

What will the code below output to the console and why?

var myObject = {
foo: "bar",
func: function() {
var self = this;
("outer func: = " + );
("outer func: = " + );
(function() {
("inner func: = " + );
("inner func: = " + );
}());
}
};
myObject.func();

Answer 1

The corrected code would demonstrate how 'this' behaves differently in different scopes, with the 'outer func' using 'this' directly and the 'inner func' using a reference called 'self' to maintain access to 'this' from the outer scope.

Step-by-step explanation:

The code provided appears to have syntax errors and incomplete lines. It is intended to demonstrate the scope of 'this' in JavaScript functions, particularly the difference between lexical scope in arrow functions and dynamic scope in traditional functions.

Assuming the code is corrected to include console.log statements, such as console.log("outer func: this.foo = " + this.foo) and console.log("inner func: self.foo = " + self.foo), it will act as follows:

• The outer func call will print the value of foo from myObject because 'this' refers to the object that is invoking the function, which in this case is myObject.
• The inner anonymous function retains the value of 'this' referring to myObject because it uses 'self', which was assigned to this in the outer function. However, if it had tried to use 'this' directly inside the inner function, it would refer to the global object (or be undefined in strict mode), not to myObject.

To summarize, the corrected output (assuming correct syntax and use of console.log) would look something like:

outer func: this.foo = bar
inner func: self.foo = bar