AI solution for JavaScript Quiz on BFE.dev
49. `this` IV

The code outputs:

1
10
1
2

Explanation:

• a.foo1.call() invokes the foo1 function with the this context set to the global object (undefined in strict mode), so it returns 1 (the original bar value in the global scope) and then increments it to 2.
• a.foo1() invokes the foo1 function with the this context set to a, so it returns 10 (the value of a.bar) and then increments it to 11.
• a.foo2.call() invokes the foo2 function with the this context set to a, but it internally calls foo which has the side effect of incrementing the value of the global bar variable, so it returns 1.
• a.foo2() invokes the foo2 function in the same way as a.foo2.call(), so it also returns 1 but because it internally increments the value of the global bar variable, the next call to foo1 will return 12.