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const fact = n => n && n * fact(n-1) || 1;
const decToBin = dec => dec && dec % 2 + 10 * decToBin(0 | dec / 2) || 0;
const iif = pr => t => f => x => pr(x) ? t(x) : f(x);
const not = fn => x => !fn(x);
const or = pra => prb => x => pra(x) || prb(x);
const isArray = x => x instanceof Array;
const isPromise = x => x instanceof Promise;
const isPlainObject = x => typeof x === 'object' && x !== null && x == '[object Object]';
const isTraversable = or(isPlainObject)(isArray);
const keys = Object.keys.bind(Object);

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Active Record

É um design pattern que o Rails implementa a partir da gem ActiveRecord.

Serve para conectar a camada Model da aplicação com tabelas do database, para assim criar um modelo de domínio persistível, onde a lógica (Model) e dados (BD) são apresentados em uma única solução.

Já persiste no BD:

obj.create

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1. Clone your fork:

git clone [email protected]:YOUR-USERNAME/YOUR-FORKED-REPO.git

2. Add remote from original repository in your forked repository:

cd into/cloned/fork-repo
git remote add upstream git://github.com/ORIGINAL-DEV-USERNAME/REPO-YOU-FORKED-FROM.git
git fetch upstream

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import React from 'react'
import useIsElementInView from './useIsElementInView'

export function Example() {
  const { ref, isInView } = useIsElementInView()

  return (
    <div ref={ref}>
      {isInView ? 'It is in the view!' : 'Not in view (so you cant really even tell if it works I guess...)'}
    </div>

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// https://letsbuildui.dev/articles/building-a-dropdown-menu-component-with-react-hooks
import { useState, useEffect, RefObject } from 'react';

export const useDetectOutsideClick = (ref: RefObject<HTMLElement>, initialState: boolean) => {
  const [isActive, setIsActive] = useState(initialState);

  useEffect(() => {
    const pageClickEvent = (event: MouseEvent) => {
      // If the active element exists and is clicked outside of
      if (ref.current !== null && !ref.current.contains(event.target as Node)) {