misc-utils-of-mine-generic
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Miscellaneous utilities for JavaScript/TypeScript that I often use
153 lines • 6.75 kB
JavaScript
;
var __awaiter = (this && this.__awaiter) || function (thisArg, _arguments, P, generator) {
function adopt(value) { return value instanceof P ? value : new P(function (resolve) { resolve(value); }); }
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) : adopt(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 = op[0] & 2 ? y["return"] : op[0] ? y["throw"] || ((t = y["return"]) && t.call(y), 0) : y.next) && !(t = t.call(y, op[1])).done) return t;
if (y = 0, t) op = [op[0] & 2, 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 };
}
};
var __spreadArrays = (this && this.__spreadArrays) || function () {
for (var s = 0, i = 0, il = arguments.length; i < il; i++) s += arguments[i].length;
for (var r = Array(s), k = 0, i = 0; i < il; i++)
for (var a = arguments[i], j = 0, jl = a.length; j < jl; j++, k++)
r[k] = a[j];
return r;
};
Object.defineProperty(exports, "__esModule", { value: true });
exports.Deferred = exports.asyncMap = exports.asyncForEach = exports.serial = void 0;
/**
* Execute given functions returning promises serially. Returns a promise that resolves when all finish with they results as array.
*/
function serial(p) {
return new Promise(function (resolve) {
p.reduce(function (promiseChain, currentTask) {
return promiseChain.then(function (chainResults) {
return currentTask().then(function (currentResult) { return __spreadArrays(chainResults, [currentResult]); });
});
}, Promise.resolve([])).then(function (arrayOfResults) {
resolve(arrayOfResults);
});
});
}
exports.serial = serial;
/** iterates serially */
function asyncForEach(array, callback) {
return __awaiter(this, void 0, void 0, function () {
var index;
return __generator(this, function (_a) {
switch (_a.label) {
case 0:
index = 0;
_a.label = 1;
case 1:
if (!(index < array.length)) return [3 /*break*/, 4];
return [4 /*yield*/, callback(array[index], index, array)];
case 2:
_a.sent();
_a.label = 3;
case 3:
index++;
return [3 /*break*/, 1];
case 4: return [2 /*return*/];
}
});
});
}
exports.asyncForEach = asyncForEach;
/** applies a map() serially */
function asyncMap(array, callback) {
return __awaiter(this, void 0, void 0, function () {
var result;
var _this = this;
return __generator(this, function (_a) {
switch (_a.label) {
case 0:
result = [];
return [4 /*yield*/, asyncForEach(array, function (item, i, a) { return __awaiter(_this, void 0, void 0, function () {
var _a, _b;
return __generator(this, function (_c) {
switch (_c.label) {
case 0:
_b = (_a = result).push;
return [4 /*yield*/, callback(item, i, a)];
case 1:
_b.apply(_a, [_c.sent()]);
return [2 /*return*/];
}
});
}); })];
case 1:
_a.sent();
return [2 /*return*/, result];
}
});
});
}
exports.asyncMap = asyncMap;
/**
* Promise like object that allows to resolve it promise from outside code. Example:
*
```
class Api {
fooReady = new Deferred<Data>()
private knower() {
inOtherMoment(data=>{
this.fooReady.resolve(data)
})
}
}
```
*/
var Deferred = /** @class */ (function () {
function Deferred(callback) {
var instance = this;
this.resolve = null;
this.reject = null;
this.status = 'pending';
this.promise = new Promise(function (resolve, reject) {
instance.resolve = function () { this.status = 'resolved'; resolve.apply(this, arguments); };
instance.reject = function () { this.status = 'rejected'; reject.apply(this, arguments); };
});
if (typeof callback === 'function') {
callback.call(this, this.resolve, this.reject);
}
}
Deferred.prototype.then = function (resolve) {
return this.promise.then(resolve);
};
Deferred.prototype.catch = function (r) {
return this.promise.catch(r);
};
return Deferred;
}());
exports.Deferred = Deferred;
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