Graphql-js: Can Types have default values?

[kevinSuttle]

For example: GraphQLBoolean. Can it default to false as it does in JavaScript? I know query variables can have default values, but I can't find any info for default types. GraphQLBooleans appear to default to null, as other GraphQL types.

[leebyron]

Types themselves never have default values, no, as that would presume too much about each contextual use.

Instead, default values are declared next to where they're desired, query variables being a good example.

[kevinSuttle]

Instead, default values are declared next to where they're desired

Can you give a non-query variable example?

[leebyron]

The other example, sort of related to variables, is field/directive arguments and input object fields. Arguments and input object fields can declare default values in the case that they're not provided: http://facebook.github.io/graphql/#sec-The-__InputValue-Type

[leebyron]

Feel free to reopen if you wish to discuss further

[kevinSuttle]

Thanks. The one thread I did want to tug at: I've not seen any examples of defining queries with query variables in schemas.

Both https://learngraphql.com/basics/query-variables/5
and https://medium.com/the-graphqlhub/graphql-tour-variables-58c6abd10f56#.pus2p7wmz only reference GraphiQL and how _not_ to write them.

I'm assuming the format is this? https://facebook.github.io/graphql/#sec-Language.Variables

[leebyron]

Yes the spec has a few examples of them in use as well as explainers for their use, but in general we need better documentation still.