115 lines
No EOL
2.2 KiB
TypeScript
115 lines
No EOL
2.2 KiB
TypeScript
// @strictNullChecks: true
|
|
|
|
const enum Choice { Unknown, Yes, No };
|
|
|
|
type YesNo = Choice.Yes | Choice.No;
|
|
type NoYes = Choice.No | Choice.Yes;
|
|
type UnknownYesNo = Choice.Unknown | Choice.Yes | Choice.No;
|
|
|
|
function f1() {
|
|
var a: YesNo;
|
|
var a: NoYes;
|
|
var a: Choice.Yes | Choice.No;
|
|
var a: Choice.No | Choice.Yes;
|
|
}
|
|
|
|
function f2(a: YesNo, b: UnknownYesNo, c: Choice) {
|
|
b = a;
|
|
c = a;
|
|
c = b;
|
|
}
|
|
|
|
function f3(a: Choice.Yes, b: UnknownYesNo) {
|
|
var x = a + b;
|
|
var x = a - b;
|
|
var x = a * b;
|
|
var x = a / b;
|
|
var x = a % b;
|
|
var x = a | b;
|
|
var x = a & b;
|
|
var x = a ^ b;
|
|
var x = -b;
|
|
var x = ~b;
|
|
var y = a == b;
|
|
var y = a != b;
|
|
var y = a === b;
|
|
var y = a !== b;
|
|
var y = a > b;
|
|
var y = a < b;
|
|
var y = a >= b;
|
|
var y = a <= b;
|
|
var y = !b;
|
|
}
|
|
|
|
function f4(a: Choice.Yes, b: UnknownYesNo) {
|
|
a++;
|
|
b++;
|
|
}
|
|
|
|
declare function g(x: Choice.Yes): string;
|
|
declare function g(x: Choice.No): boolean;
|
|
declare function g(x: Choice): number;
|
|
|
|
function f5(a: YesNo, b: UnknownYesNo, c: Choice) {
|
|
var z1 = g(Choice.Yes);
|
|
var z2 = g(Choice.No);
|
|
var z3 = g(a);
|
|
var z4 = g(b);
|
|
var z5 = g(c);
|
|
}
|
|
|
|
function assertNever(x: never): never {
|
|
throw new Error("Unexpected value");
|
|
}
|
|
|
|
function f10(x: YesNo) {
|
|
switch (x) {
|
|
case Choice.Yes: return "true";
|
|
case Choice.No: return "false";
|
|
}
|
|
}
|
|
|
|
function f11(x: YesNo) {
|
|
switch (x) {
|
|
case Choice.Yes: return "true";
|
|
case Choice.No: return "false";
|
|
}
|
|
return assertNever(x);
|
|
}
|
|
|
|
function f12(x: UnknownYesNo) {
|
|
if (x) {
|
|
x;
|
|
}
|
|
else {
|
|
x;
|
|
}
|
|
}
|
|
|
|
function f13(x: UnknownYesNo) {
|
|
if (x === Choice.Yes) {
|
|
x;
|
|
}
|
|
else {
|
|
x;
|
|
}
|
|
}
|
|
|
|
type Item =
|
|
{ kind: Choice.Yes, a: string } |
|
|
{ kind: Choice.No, b: string };
|
|
|
|
function f20(x: Item) {
|
|
switch (x.kind) {
|
|
case Choice.Yes: return x.a;
|
|
case Choice.No: return x.b;
|
|
}
|
|
}
|
|
|
|
function f21(x: Item) {
|
|
switch (x.kind) {
|
|
case Choice.Yes: return x.a;
|
|
case Choice.No: return x.b;
|
|
}
|
|
return assertNever(x);
|
|
} |