98 lines
3.4 KiB
JavaScript
98 lines
3.4 KiB
JavaScript
|
//// [typeGuardOfFormExpr1AndExpr2.ts]
|
||
|
var str: string;
|
||
|
var bool: boolean;
|
||
|
var num: number;
|
||
|
var strOrNum: string | number;
|
||
|
var strOrNumOrBool: string | number | boolean;
|
||
|
var numOrBool: number | boolean;
|
||
|
class C { private p; }
|
||
|
var c: C;
|
||
|
var cOrBool: C| boolean;
|
||
|
var strOrNumOrBoolOrC: string | number | boolean | C;
|
||
|
|
||
|
// A type guard of the form expr1 && expr2
|
||
|
// - when true, narrows the type of x by expr1 when true and then by expr2 when true, or
|
||
|
// - when false, narrows the type of x to T1 | T2, where T1 is the type of x narrowed by expr1 when
|
||
|
// false, and T2 is the type of x narrowed by expr1 when true and then by expr2 when false.
|
||
|
|
||
|
// (typeguard1 && typeguard2)
|
||
|
if (typeof strOrNumOrBool !== "string" && typeof strOrNumOrBool !== "number") {
|
||
|
bool = strOrNumOrBool; // boolean
|
||
|
}
|
||
|
else {
|
||
|
strOrNum = strOrNumOrBool; // string | number
|
||
|
}
|
||
|
// (typeguard1 && typeguard2 && typeguard3)
|
||
|
if (typeof strOrNumOrBoolOrC !== "string" && typeof strOrNumOrBoolOrC !== "number" && typeof strOrNumOrBoolOrC !== "boolean") {
|
||
|
c = strOrNumOrBoolOrC; // C
|
||
|
}
|
||
|
else {
|
||
|
strOrNumOrBool = strOrNumOrBoolOrC; // string | number | boolean
|
||
|
}
|
||
|
// (typeguard1 && typeguard2 && typeguard11(onAnotherType))
|
||
|
if (typeof strOrNumOrBoolOrC !== "string" && typeof strOrNumOrBoolOrC !== "number" && typeof strOrNumOrBool === "boolean") {
|
||
|
cOrBool = strOrNumOrBoolOrC; // C | boolean
|
||
|
bool = strOrNumOrBool; // boolean
|
||
|
}
|
||
|
else {
|
||
|
var r1: string | number | boolean | C = strOrNumOrBoolOrC; // string | number | boolean | C
|
||
|
var r2: string | number | boolean = strOrNumOrBool;
|
||
|
}
|
||
|
// (typeguard1) && simpleExpr
|
||
|
if (typeof strOrNumOrBool !== "string" && numOrBool !== strOrNumOrBool) {
|
||
|
numOrBool = strOrNumOrBool; // number | boolean
|
||
|
}
|
||
|
else {
|
||
|
var r3: string | number | boolean = strOrNumOrBool; // string | number | boolean
|
||
|
}
|
||
|
|
||
|
//// [typeGuardOfFormExpr1AndExpr2.js]
|
||
|
var str;
|
||
|
var bool;
|
||
|
var num;
|
||
|
var strOrNum;
|
||
|
var strOrNumOrBool;
|
||
|
var numOrBool;
|
||
|
var C = (function () {
|
||
|
function C() {
|
||
|
}
|
||
|
return C;
|
||
|
})();
|
||
|
var c;
|
||
|
var cOrBool;
|
||
|
var strOrNumOrBoolOrC;
|
||
|
// A type guard of the form expr1 && expr2
|
||
|
// - when true, narrows the type of x by expr1 when true and then by expr2 when true, or
|
||
|
// - when false, narrows the type of x to T1 | T2, where T1 is the type of x narrowed by expr1 when
|
||
|
// false, and T2 is the type of x narrowed by expr1 when true and then by expr2 when false.
|
||
|
// (typeguard1 && typeguard2)
|
||
|
if (typeof strOrNumOrBool !== "string" && typeof strOrNumOrBool !== "number") {
|
||
|
bool = strOrNumOrBool; // boolean
|
||
|
}
|
||
|
else {
|
||
|
strOrNum = strOrNumOrBool; // string | number
|
||
|
}
|
||
|
// (typeguard1 && typeguard2 && typeguard3)
|
||
|
if (typeof strOrNumOrBoolOrC !== "string" && typeof strOrNumOrBoolOrC !== "number" && typeof strOrNumOrBoolOrC !== "boolean") {
|
||
|
c = strOrNumOrBoolOrC; // C
|
||
|
}
|
||
|
else {
|
||
|
strOrNumOrBool = strOrNumOrBoolOrC; // string | number | boolean
|
||
|
}
|
||
|
// (typeguard1 && typeguard2 && typeguard11(onAnotherType))
|
||
|
if (typeof strOrNumOrBoolOrC !== "string" && typeof strOrNumOrBoolOrC !== "number" && typeof strOrNumOrBool === "boolean") {
|
||
|
cOrBool = strOrNumOrBoolOrC; // C | boolean
|
||
|
bool = strOrNumOrBool; // boolean
|
||
|
}
|
||
|
else {
|
||
|
var r1 = strOrNumOrBoolOrC; // string | number | boolean | C
|
||
|
var r2 = strOrNumOrBool;
|
||
|
}
|
||
|
// (typeguard1) && simpleExpr
|
||
|
if (typeof strOrNumOrBool !== "string" && numOrBool !== strOrNumOrBool) {
|
||
|
numOrBool = strOrNumOrBool; // number | boolean
|
||
|
}
|
||
|
else {
|
||
|
var r3 = strOrNumOrBool; // string | number | boolean
|
||
|
}
|