underscores

Why is a single underscore character an illegal name for a lambda parameter?

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The reason is expressed in this post from Brian Goetz himself: We are “reclaiming” the syntactic real estate of “_” from the space of identifiers for use in future language features. However, because there are existing programs that might use it, it is a warning for identifiers that occur in existing syntactic positions for 8, … Read more

What does an underscore and interface name after keyword var mean?

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It provides a static (compile time) check that boolType satisfies the ValueConverter interface. The _ used as a name of the variable tells the compiler to effectively discard the RHS value, but to type-check it and evaluate it if it has any side effects, but the anonymous variable per se doesn’t take any process space. … Read more

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