Null Object Design Pattern (Software Design Patterns Tutorial)
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******************** Null Object Design Pattern:
→ Replace “null” check.
→ Traditional method: null check for every value which has some limitations in code flow. If we follow “null object design pattern” then we can over that hurdle.
→ Default behaviour for objects which has “null” or “nothing.
→ Null object class is the default implementation.
→ It would very useful if we want some special flow for something which has nothing or null value.
→ Example: Spam classification.
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