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Corrected patterns.md to use discard pattern ('_') in examples instead of star (*). (#610)

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Eik Rentzow 2017-06-05 21:57:57 +02:00 committed by Neal Gafter
parent b5cc2c882d
commit 236dff2783
1 changed files with 5 additions and 5 deletions
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10
proposals/patterns.md
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@ -256,7 +256,7 @@ And now we can operate on `Cartesian` values using polar coordinates
```cs
var c = Cartesian(3, 4);
if (c is Polar(var R, *)) Console.WriteLine(R);
if (c is Polar(var R, _)) Console.WriteLine(R);
```
Which prints `5`.
@ -468,7 +468,7 @@ Expr Deriv(Expr e)
{
switch (e) {
case X(): return Const(1);
case Const(*): return Const(0);
case Const(_): return Const(0);
case Add(var Left, var Right):
return Add(Deriv(Left), Deriv(Right));
case Mult(var Left, var Right):
@ -485,8 +485,8 @@ An expression simplifier demonstrates positional patterns:
Expr Simplify(Expr e)
{
switch (e) {
case Mult(Const(0), *): return Const(0);
case Mult(*, Const(0)): return Const(0);
case Mult(Const(0), _): return Const(0);
case Mult(_, Const(0)): return Const(0);
case Mult(Const(1), var x): return Simplify(x);
case Mult(var x, Const(1)): return Simplify(x);
case Mult(Const(var l), Const(var r)): return Const(l*r);
@ -508,7 +508,7 @@ var areas =
case Line l: 0,
case Rectangle r: r.Width * r.Height,
case Circle c: Math.PI * c.Radius * c.Radius,
case *: throw new ApplicationException()
case _: throw new ApplicationException()
)
select new { Primitive = primitive, Area = area };
```