Can Go Variables of Different Types Be Declared in One Line Without the Short Variable Declaration Syntax?

Multiple Variables of Different Types in One Line (Go)

In Go, it's possible to declare and initialize multiple variables of the same type in a single line using the syntax var a, b string = "hello", "world". However, the question arises whether this can be achieved for variables of different types without employing the short variable declaration syntax (:=).

Answer

Yes, it is feasible to declare and initialize variables of different types in one line without using the := syntax. The key is to omit the type specification. This can be accomplished with the syntax: var i, s = 2, "hi". In this example, i will be an integer and s will be a string.

Mechanism

The short variable declaration syntax (:=) is a shorthand for the more verbose syntax var IdentifierList = ExpressionList. When using :=, the compiler infers the types of the variables based on the assigned expressions. Omitting the type specification in the non-short declaration syntax allows us to explicitly specify the types ourselves.

As the Go language specification states, "A VarSpec (variable specification) can have one or more IdentifierList elements, which may include parenthesized subsets of identifiers." This means that we can declare multiple variables with different types in a single var statement by separating them with commas.

Conclusion

While it is possible to declare multiple variables of different types in one line without using the short variable declaration syntax, it is generally not recommended as it can lead to decreased readability. However, this knowledge provides flexibility in certain situations.

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