imkrish

// Delete all data in elasticsearch
curl -X DELETE 'http://localhost:9200/_all'

// Backup data to data.json
elasticdump --input=data.json --output=http://localhost:9200 --type=data

// Import data.json to elasticsearch
elasticdump --input=http://localhost:9200/ --output=data.json --type=data --limit 50000

imkrish

const observable = of('response')

observable.subscribe(result => {
  // Do the logic with the result emited by the observable
  // .................
  // .................
  // .................
});

imkrish

const observable = of('response')

observable.pipe(first()).subscribe(result => {
  // Do the logic with the result emited by the observable
  // .................
  // .................
  // .................
});

imkrish

const observable = of('response')

const result = await getValue(observable)
// Do the logic with the result
// .................
// .................
// .................

imkrish

const observable = of('response')

function hasValue(value: any) {
  return value !== null && value !== undefined;
}

function getValue<T>(observable: Observable<T>): Promise<T> {
  return observable
    .pipe(
      filter(hasValue),

imkrish

const iAmAwesome = true;
iAmAwesome = false; // Cannot assign to 'iAmAwesome' because it is a constant

imkrish

interface User {
  id: number;
  name: string;
}

const user: User = {
  id: 1,
  name: "Keerati"
};

imkrish

interface User {
  readonly id: number;
  name: string;
}

const user: User = {
  id: 1,
  name: "Keerati"
};

imkrish

const numbers: number[] = [1, 2, 3, 4, 5];
numbers.push(6); // There is nothing wrong with this

imkrish

const numbers: ReadonlyArray<number> = [1, 2, 3, 4, 5];
numbers.push(6); // Property 'push' does not exist on type 'ReadonlyArray<number>'