< > BotCompany Repo | #1005176 // getSingleton - assert a list/array has exactly one element and get it

JavaX fragment (include)

static <A> A getSingleton(L<A> l) {
  assertEquals(1, l(l));
  ret first(l);
}

static <A> A getSingleton(A[] l) {
  assertEquals(1, l(l));
  ret first(l);
}

ifclass IMultiSet
static <A> A getSingleton(IMultiSet<A> ms) {
  assertEquals(1, l(ms));
  ret first(ms);
}
endif

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