[Solved] In the following code snippet implementing the Interpreter pattern, what is the error? class OrExpression:... In the following code snippet implementing the Interpreter pattern, what is the error? | LLD

LLD - Behavioral Design Patterns — Part 2

In the following code snippet implementing the Interpreter pattern, what is the error?

class OrExpression:
    def __init__(self, expr1, expr2):
        self.expr1 = expr1
        self.expr2 = expr2
    def interpret(self, context):
        return self.expr1.interpret(context) | self.expr2.interpret(context)

AUsing bitwise OR operator instead of logical OR

BMissing return statement in interpret method

CIncorrect constructor parameters

Dinterpret method missing context parameter

Step-by-Step Solution

Solution:

Step 1: Identify operator used in interpret method
The code uses the bitwise OR operator '|' instead of the logical OR operator 'or' for boolean logic.
Step 2: Explain why this is an error
Bitwise OR can cause unexpected results with booleans and is not the intended logical operation for combining expressions.
Final Answer:
Using bitwise OR operator instead of logical OR -> Option A
Quick Check:
Logical OR needs 'or', not '|' [OK]

Quick Trick: Use 'or' for logical OR, not '|' [OK]

Common Mistakes:

MISTAKES

Confusing bitwise and logical operators
Forgetting to return a value
Incorrect method signatures

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In the following code snippet implementing the Interpreter pattern, what is the error?

Step 1: Identify operator used in interpret method

Step 2: Explain why this is an error

Final Answer:

Quick Check:

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