public void Option_Bind_takes_OT_Xform_OR(int?num)
{
var oval = OptionExt.FromNullable(num);
var xform = oval.Bind(val => val == null ? None : Some($"the val is {val.Value}"));
xform.Match(() => Assert.True(num == null), x => Assert.True(x is string));
}
public void Option_Map_OT_F_T_to_R(int?num)
{
var opv = OptionExt.FromNullable(num);
var res = opv.Map(val => $"the val is {val}");
res.Match(() => Assert.True(num == null),
s => Assert.True(s is string));
}
public void Select_Transform_T_into_OR(int?num)
{
var oval = OptionExt.FromNullable(num);
var res = oval.Select <int?, string>(v => v == null ? null :$"this val={v}");
res.Match(() => Assert.True(num == null),
v => Assert.Equal($"this val={num.Value}", v));
}
public void Apply_accept_OT_To_A_Func_Returns_New_Func_With_OT_Applied(int?num)
{
var ot = OptionExt.FromNullable(num);
Option <Func <int?, string> > OFunc = Some <Func <int?, string> >(val => $"this is the val {val}");
var res = OFunc.Apply(ot);
res.Match(
() => Assert.True(num == null),
val => Assert.Equal(val, $"this is the val {num.Value}"));
}
public void Apply_2_param_To_Func_one_At_a_time(int?num1, int?num2)
{
var oval1 = OptionExt.FromNullable(num1);
var oval2 = OptionExt.FromNullable(num2);
var isnull = oval1 == null || oval2 == null;
var OptionSum = Some <Func <int?, int?, int?> >((n1, n2) => n1 == null || n2 == null ?(int?)null : n1.Value + n2.Value);
OptionSum.Apply(oval1)
.Apply(oval2)
.Match(() => Assert.True(isnull),
val => Assert.Equal(num1.Value + num2.Value, val.Value));
}
public void Apply_3_parameters_one_at_a_time(int?num1, int?num2, int?num3)
{
var ov1 = OptionExt.FromNullable(num1);
var ov2 = OptionExt.FromNullable(num2);
var ov3 = OptionExt.FromNullable(num3);
var OFunc = Some <Func <int?, int?, int?, int?> >((n1, n2, n3) => n1 == null || n2 == null || n3 == null ?(int?)null : n1.Value + n2.Value + n3.Value);
var isnull = ov1 == null || ov2 == null || ov3 == null;
OFunc.Apply(ov1)
.Apply(ov2)
.Apply(ov3)
.Match(() => Assert.True(isnull),
val => Assert.Equal(num1.Value + num2.Value + num3.Value, val.Value));
}
public void SelectMany_combine_many_Option_into_single_scope(int?num1, int?num2, int?num3)
{
var o1 = OptionExt.FromNullable(num1);
var o2 = OptionExt.FromNullable(num2);
var o3 = OptionExt.FromNullable(num3);
var res = from a in o1
from b in o2
from c in o3
select a + b + c;
var isNone = num1 == null || num2 == null || num3 == null;
res.Match(() => Assert.True(isNone),
v => Assert.Equal(num1 + num2 + num3, v));
}
public void Option_Of_T_Return_Some_if_Valid_None_If_invalid(int?num)
{
var val = OptionExt.FromNullable(num);
val.Match(() => Assert.True(num == null), v1 => Assert.Equal(num.Value, v1.Value));
}