Language          Integer Types          Float / Double Types          Character Type          String Type          Boolean Type          Variable Keyword(s)          Notes / Remarks

● Swift          Int, UInt          Float,
Double          Character          String          Bool          var, let          let → immutable; var → mutable

● Kotlin          Int, Long, Short, Byte          Float,
Double          Char          String          Boolean          var, val          val → read-only; suffix f for Float values

● TypeScript
(JS)          number          same (number)          no separate
char type (use string)          string          boolean          let, const          const for constants; let block-scoped

● Dart          int          double          no separate
char (use String)          String          bool          var, final, const          final → runtime constant; const → compile-time

● C#          int, long, short, byte          float, double, decimal          char          string          bool          explicit type or var          var → type-inferred at compile time