Library for creating tagged constructors.
Creates a new constructor with the given field names as
arguments and properties. Allows instanceof checks with
returned constructor.
var Tuple3 = daggy.tagged('x', 'y', 'z');
var _123 = Tuple3(1, 2, 3); // optional new keyword
_123.x == 1 && _123.y == 2 && _123.z == 3; // true
_123 instanceof Tuple3; // trueCreates a constructor for each key in constructors. Returns a
function with each constructor as a property. Allows
instanceof checks for each constructor and the returned
function.
var Option = daggy.taggedSum({
Some: ['x'],
None: []
});
Option.Some(1) instanceof Option.Some; // true
Option.Some(1) instanceof Option; // true
Option.None instanceof Option; // true
function incOrZero(o) {
return o.cata({
Some: function(x) {
return x + 1;
},
None: function() {
return 0;
}
});
}
incOrZero(Option.Some(1)); // 2
incOrZero(Option.None); // 0
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