1. **State the problem:** Calculate the value of the expression $4 - (-2)$. 2. **Recall the rule:** Subtracting a negative number is equivalent to adding its positive counterpart. So, $a - (-b) = a + b$. 3. **Apply the rule:** $$4 - (-2) = 4 + 2$$ 4. **Calculate the sum:** $$4 + 2 = 6$$ 5. **Final answer:** $$\boxed{6}$$