• A single-line comment.Dart also supports multi-line and document comments.For details, see .
• int
• A type. Some of the other built-in typesare String, List, and .
• A number literal. Number literals are a kind of compile-time constant.
• print()
• A handy way to display output.
• '…' (or )
• $variableName (or ${expression})
• String interpolation: including a variable or expression’s stringequivalent inside of a string literal. For more information, see.
• main()
• The special, required, top-level function where app executionstarts. For more information, seeThe main() function.
• A way to declare a variable without specifying its type.