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News APIs:

• Fetch: [GET] -> /news/:id
• List: [GET] -> /news/list
• Add: [POST] -> /news
• Update: [POST] -> /news/:id
• Remove: [DELETE] -> /news/:id

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// ref: https://gitlab.com/manning-fpcpp-book/code-examples/-/blob/master/chapter-01/count-lines-transform/main.cpp
#include <iostream>
#include <string>
#include <vector>
#include <unordered_map>
#include <fstream>
#include <algorithm>
#include <iterator>
#include <ranges>

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this.query = (filter: Filter) =>
  Observable.from(
    this.api.getData(filter).switchMap((res) => {
      this.setData(res)
    })
  )

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var alphabetBoardPath=function(f){var g=new Map(Array.from("abcdefghijklmnopqrstuvwxyz").map(function(a,c){return[a,{x:c/5|0,y:c%5|0}]})),d=function(a,c){return 0>=c?"":a.repeat(c)},a={x:0,y:0};return Array.from(f).reduce(function(e,c){var b=g.get(c);e.push(b.y<a.y?d("L",a.y-b.y):"",b.x<a.x?d("U",a.x-b.x):"",b.x>a.x?d("D",b.x-a.x):"",b.y>a.y?d("R",b.y-a.y):"","!");a=b;return e},[]).join("")};

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const alphabetBoardPath = (target) => {
  const layout = 5
  const hashMap = new Map(Array.from("abcdefghijklmnopqrstuvwxyz").map((c, i) => [ c,  {x: (i / layout) | 0, y: i % layout | 0}]))
  const repeat = (s, n) => (n <= 0 ? '' : s.repeat(n))
  let p0 = { x: 0, y: 0 }
  return Array.from(target).reduce((ret, t) => {
    const p = hashMap.get(t)
    ret.push(p.y < p0.y ? repeat('L', p0.y - p.y) : '', p.x < p0.x ? repeat('U', p0.x - p.x) : '', p.x > p0.x ? repeat('D', p.x - p0.x) : '', p.y > p0.y ? repeat('R', p.y - p0.y) : '', '!')
    p0 = p
    return ret

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const alphabetBoardPath = (target) => {
	const layout = 5
	const hashMap = new Map(Array.from("abcdefghijklmnopqrstuvwxyz")
		.map((c, i) => [ c,  {x: (i / layout) | 0, y: i % layout | 0}]))
	const repeat = (s, n) => (n <= 0 ? '' : s.repeat(n))
	
	let p0 = { x: 0, y: 0 }
	
	const ret = Array.from(target).reduce((ret, t) => {
		const p = hashMap.get(t)

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const delay = (delay) => () => new Promise((resolve, reject) => setTimeout(resolve, delay))
const main = () => f1().then(f2).catch(f3)

const f1 = () =>  new Promise((resolve, reject) => ret ? resolve() : reject())
const f2 = () => Promise.resolve('f2')
const f3 = () => Promise.resolve('f3')

let ret = true
const next = () => ret = !ret

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{
  "compilerOptions": {
    "allowSyntheticDefaultImports": true,
    "declaration": false,
    "emitDecoratorMetadata": true,
    "experimentalDecorators": true,
    "lib": ["dom", "es2015"],
    "module": "es2015",
    "moduleResolution": "node",
    "sourceMap": true,

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let user = new User(filterByProps(form, [
  'username',
  'displayname'
]))
  
function filterByProps(obj: any, props: string[]): any {
  if (!props) return obj
  let ret = {}
  Object.keys(obj).forEach(key => {
    if (props.some(prop => prop === key)) {

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export function filterByProps(obj: any, props: string[]): any {
  if (!props) return obj
  let ret = {}
  Object.keys(obj).forEach(key => {
    if (props.some(prop => prop === key)) {
      ret[key] = clone(obj[key])
    }
  })
  return ret
}