Valid for-of loop

You need to remove the initializer (value = 50) in the head of the for-of loop. Maybe you intended to make 50 an offset value, in that case, you could add it to the loop body, for example. const iterable = [10, 20, 30]; for (let value of iterable) { value += 50; console.log(value); } // 60 // 70 // 80