Design pattern

1.[Design pattern] outline ⚙

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2.[Design pattern] Singleton 🙆‍♂️, (Creational patterns)

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3.[Design pattern] Factory method 🖲, (Creational patterns)

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4.[Design pattern] Abstract Factory Methods 🖇, (Creational patterns)

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5.[Design pattern] Builder Pattern 🎞, (Creational patterns)

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