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Dart Standard Library
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dart:io
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dart:async
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dart:math
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dart:core
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dart:collection
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dart:mirrors
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dart:isolate
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var → The variable will be reassigned in the future
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final → The variable will never be reassigned
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const on variable → Compile time constant variable, can be used to define other constant values
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const on value → Compile time constant value, it will never change in any way. Different value type work differently with const
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생성된 클래스를 const로 쓰고 싶은 경우, 클래스 생성자 선언을 const로 해줘야 한다.