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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.
1function expect(val) {
2In JavaScript, the expect function returns an object with two methods: toBe and notToBe. These methods use closures to access the value originally passed into expect. When toBe is called, it checks if the values are strictly equal and returns true or throws an error appropriately. Similarly, notToBe checks for inequality and handles it in the same manner. The use of closures allows these methods to always reference the correct original val that expect was called with.
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).
1public class Expect {
2 private Object val;
3
4 public Expect(Object val) {
5 this.val = val;
6 }
7
8 public boolean toBe(Object value) {
9 if (val.equals(value)) {
10 return true;
11 }
12 throw new RuntimeException("Not Equal");
13 }
14
15 public boolean notToBe(Object value) {
16 if (!val.equals(value)) {
17 return true;
18 }
19 throw new RuntimeException("Equal");
20 }
21}
22
23// Usage:
24// new Expect(5).toBe(5);
25In Java, the Expect class keeps the value to be compared against in an instance variable. The toBe and notToBe methods perform equality checks using equals. Java's exception handling is used to simulate the throw behavior of JavaScript.