data-interchange
Version:
Data interchange handler & DB fallback handler
39 lines (38 loc) • 1.73 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());
});
};
Object.defineProperty(exports, "__esModule", { value: true });
exports.boomerang = exports.BOOMERANG_RETURN = void 0;
exports.BOOMERANG_RETURN = Symbol();
/**
* Iterate over an array and return when a certain point is met
* - Asynchronously iterate over an array of items until the
* return symbol is returned, which causes the boomerang to
* walk backwards over the list again
*/
function boomerang(arr, cb) {
return __awaiter(this, void 0, void 0, function* () {
let shouldReturn = false, returnIndex;
for (let ind = 0; ind < arr.length; ind += 1) {
let ret = yield cb(arr[ind], ind, false);
if (ret === exports.BOOMERANG_RETURN) {
shouldReturn = true;
returnIndex = ind - 1;
break;
}
}
if (shouldReturn && returnIndex >= 0) {
for (let ind = returnIndex; ind >= 0; ind -= 1) {
yield cb(arr[ind], ind, true);
}
}
});
}
exports.boomerang = boomerang;