6.4.12 Single pattern check

The compiler provides the function match to check if an enum value matches a given pattern:

var myTree = Node(Leaf("foo"), Node(Leaf("bar"), Leaf("foobar")));
trace(myTree.match(Leaf(_))); // false
trace(myTree.match(Node(_) | Leaf(_))); // true
trace(myTree.match(Node(Leaf("foo"), _))); // true

As this function only tests if the pattern is matched, guards and variable capture are unavailable.

The match function is equivalent to a switch with a single case for the given pattern, returning true, and a default returning false.

var myTree = Node(Leaf("foo"), Node(Leaf("bar"), Leaf("foobar")));
myTree.match(Node(_));
// is equivalent to
switch (myTree) {
  case Node(_):
    true;
  case _:
    false;
}

See the EnumValue API documentation (since Haxe 3.2.1) for more information.

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