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Part 4: Firebase Technical Challenges

Question 1: Creating a Smart User Ranking System in Firestore

The traditional approach of simply chaining .orderBy() methods won't create a true multi-factor ranking system for our potential users. We need a more sophisticated solution that truly balances all three factors.

Here's my approach using a composite scoring method:

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unalias gclb 2>/dev/null

gclb() {
  git checkout development || return
  local branches
  branches=$(git branch --format="%(refname:short)" | grep -Fxv "development")
  if [ -z "$branches" ]; then
    echo $'\033[0;32mNo branches to be deleted.\033[0m'
    return
  fi

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const {
  withAppDelegate,
  withInfoPlist,
  withEntitlementsPlist,
  withAppBuildGradle,
  withMainApplication,
  withStringsXml,
  AndroidConfig,
} = require('@expo/config-plugins');
const { mergeContents } = require('@expo/config-plugins/build/utils/generateCode');

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{
  "main": "index.tsx",
}

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import {
  blue,
  blueDark,
  gray,
  grayDark,
  green,
  greenDark,
  orange,
  orangeDark,
  pink,

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import { createContext, useContext, useRef } from 'react'
import { Button, Text } from 'tamagui'
import { createStore, useStore, type StateCreator, type StoreApi } from 'zustand'

const ViewModelContext = createContext<StoreApi<any> | null>(null)

const ViewModelProvider = <T,>({
  children,
  initializer,
}: React.PropsWithChildren<{ initializer: StateCreator<T> }>) => {

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import { useState } from 'react'
import Animated, {
  Extrapolation,
  interpolate,
  useAnimatedScrollHandler,
  useAnimatedStyle,
  useSharedValue,
} from 'react-native-reanimated'
import { Card, Text, View } from 'tamagui'

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import React from "react";
import { useForm, FormProvider } from "react-hook-form";
import { zodResolver } from "@hookform/resolvers/zod";
import { z } from "zod";

const baseRincianNilaiSchema = z
  .object({
    name: z.string(),
    persenan: z.string(),
    child: z.array(z.any()).optional(), // Fine-tune this as needed

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import { CountryCode } from 'libphonenumber-js';

import { AppLocale } from './i18n';

export const countriesWithLocale: Record<AppLocale, Record<CountryCode, string>> = {
  en: {
    AC: 'Ascension Island',
    AD: 'Andorra',
    AE: 'United Arab Emirates',
    AF: 'Afghanistan',

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enum Currency {
  IDR = "IDR",
  USD = "USD",
}

const separator: Record<Currency, string> = {
  IDR: ".",
  USD: ",",
};