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The closure-based approach makes use of JavaScript's closure capabilities to encapsulate the comparison logic within the returned object. The main idea here is to utilize closures to maintain the original value passed to the expect function, and then provide methods that perform the respective comparisons. This approach leverages the benefits of closures to maintain a clean and functional interface.
Time Complexity: O(1) for both toBe and notToBe methods as they perform constant time operations.
Space Complexity: O(1) since the space required does not grow with the size of the input.
1class Expect:
2 def
In Python, we use a class to mimic the behavior of closures. The class Expect holds the value in its instance variable val. The methods toBe and notToBe perform the same checks and raise exceptions if conditions are not met. This is a good example of using OOP principles to simulate a closure-like behavior in Python.
The class-based approach in languages like C++, C#, and Java exploits object-oriented programming features to achieve encapsulation and method binding. Here, the idea is to define a class that keeps track of the initial value and provides methods that can be invoked on it to perform the required checks. This method is beneficial for languages where closures don't exist or are cumbersome to implement, maintaining a clear object-oriented design.
Time Complexity: O(1) for both methods.
Space Complexity: O(1).
1#include <stdexcept>
2
3class Expect {
4public:
5 Expect(int val) : val_(val) {}
6
7 bool toBe(int value) {
8 if (val_ == value) {
9 return true;
10 }
11 throw std::runtime_error("Not Equal");
12 }
13
14 bool notToBe(int value) {
15 if (val_ != value) {
16 return true;
17 }
18 throw std::runtime_error("Equal");
19 }
20
21private:
22 int val_;
23};
24
25// Usage:
26// Expect(5).toBe(5);
27In C++, the Expect class is used to encapsulate the initial value. The constructor initializes this value and the methods toBe and notToBe perform the comparisons. If conditions are not satisfied, they throw runtime errors. This class-based approach leverages C++'s support for OOP to provide a straightforward implementation.