Union Types - language feature

declare type numOrString = string | number

Example from GraphQL:

union SearchResult = Human | Droid | Starship

Example from C3:

union Foo
{
  int x;
  float f;
  struct 
  {
    char[2] z;
  }  
}

Languages with Union Types include TypeScript, GraphQL, C3, C2

Read more about Union Types on the web: 1.

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