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asyncExapmple.js
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123 lines (123 loc) · 4.4 KB
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var __awaiter = (this && this.__awaiter) || function (thisArg, _arguments, P, generator) {
return new (P || (P = Promise))(function (resolve, reject) {
function fulfilled(value) { try {
step(generator.next(value));
}
catch (e) {
reject(e);
} }
function rejected(value) { try {
step(generator["throw"](value));
}
catch (e) {
reject(e);
} }
function step(result) { result.done ? resolve(result.value) : new P(function (resolve) { resolve(result.value); }).then(fulfilled, rejected); }
step((generator = generator.apply(thisArg, _arguments || [])).next());
});
};
var __generator = (this && this.__generator) || function (thisArg, body) {
var _ = { label: 0, sent: function () { if (t[0] & 1)
throw t[1]; return t[1]; }, trys: [], ops: [] }, f, y, t, g;
return g = { next: verb(0), "throw": verb(1), "return": verb(2) }, typeof Symbol === "function" && (g[Symbol.iterator] = function () { return this; }), g;
function verb(n) { return function (v) { return step([n, v]); }; }
function step(op) {
if (f)
throw new TypeError("Generator is already executing.");
while (_)
try {
if (f = 1, y && (t = y[op[0] & 2 ? "return" : op[0] ? "throw" : "next"]) && !(t = t.call(y, op[1])).done)
return t;
if (y = 0, t)
op = [0, t.value];
switch (op[0]) {
case 0:
case 1:
t = op;
break;
case 4:
_.label++;
return { value: op[1], done: false };
case 5:
_.label++;
y = op[1];
op = [0];
continue;
case 7:
op = _.ops.pop();
_.trys.pop();
continue;
default:
if (!(t = _.trys, t = t.length > 0 && t[t.length - 1]) && (op[0] === 6 || op[0] === 2)) {
_ = 0;
continue;
}
if (op[0] === 3 && (!t || (op[1] > t[0] && op[1] < t[3]))) {
_.label = op[1];
break;
}
if (op[0] === 6 && _.label < t[1]) {
_.label = t[1];
t = op;
break;
}
if (t && _.label < t[2]) {
_.label = t[2];
_.ops.push(op);
break;
}
if (t[2])
_.ops.pop();
_.trys.pop();
continue;
}
op = body.call(thisArg, _);
}
catch (e) {
op = [6, e];
y = 0;
}
finally {
f = t = 0;
}
if (op[0] & 5)
throw op[1];
return { value: op[0] ? op[1] : void 0, done: true };
}
};
function delay(milliseconds, count) {
return new Promise(function (resolve) {
setTimeout(function () {
resolve(count);
}, milliseconds);
});
}
// async function always return a Promise
function dramaticWelcome() {
return __awaiter(this, void 0, void 0, function () {
var i, count;
return __generator(this, function (_a) {
switch (_a.label) {
case 0:
console.log("Hello");
i = 0;
_a.label = 1;
case 1:
if (!(i < 5))
return [3 /*break*/, 4];
return [4 /*yield*/, delay(500, i)];
case 2:
count = _a.sent();
console.log(count);
_a.label = 3;
case 3:
i++;
return [3 /*break*/, 1];
case 4:
console.log("World!");
return [2 /*return*/];
}
});
});
}
dramaticWelcome();