rcdexta

class UserEventsProcessor
  include Shoryuken::Worker

  shoryuken_options queue: 'User_Events.fifo', auto_delete: true

 def perform(_sqs_event, payload)
    Rails.logger.info("_sqs_event: #{_sqs_event}")
    Rails.logger.info("UserEventsProcessor payload: #{payload}")    
  end
end

rcdexta

interface Customer {
    name: string
    phone: string
}

declare function getCustomerData(id: string): Promise<Customer>;
declare function payCustomer(customer: Customer): void;

async function f() {
    const customer = getCustomerData('c1')

rcdexta

function isDate(input: unknown) : asserts input is Date { 
  if (input instanceof Date) 
    return; 
  else 
    throw new Error('Input must be a Date!'); 
} 

function getYear(input: unknown) : number { 
  isDate(input); 
  return input.getFullYear()  // TypeScripts knows that input is Date 

rcdexta

function isDate(input: unknown) { 
  if (input instanceof Date) 
    return; 
  else 
    throw new Error('Input must be a Date!'); 
} 

function getDayOfWeek(input: unknown) : number { 
  isDate(input); 
  return input.getFullYear() // TypeScript will fail compilation here!

rcdexta

// Before
passPhrase = data.inputString || 'Unknown'  //will not accept "" (empty string)
passCode =  data.number || '-1111' // will not accept 0 
rememberMe = data.rememberFlag || true // will always be true!!!


// Now
passPhrase = data.inputString ?? 'Unknown'  //Unknown only if inputString is not defined
passCode =  data.number ?? '-1111' // 0 could be a passCode
rememberMe = data.rememberFlag ?? true // false is a valid value

rcdexta

// Prior to v3.7
if (data && data.customer && data.customer.address) {
   const {address} = data.customer
   const fullAddress = `${address.street}, ${address.city}, ${address.state }${address.zipcode}`
}

// v3.7 onwards

// data access
const address = data?.customer?.address

rcdexta

var array = [undefined, 'cat', false, 434, '', 32.0]
_.compact(array)
array.filter(Boolean)

rcdexta

var elements = [1,2,3,1,2,4,2,3,5,3]

_.uniq(elements)

[...new Set(elements)]

rcdexta

const primes = [2,3,5,7,11,13,17,19,23,29,31,37,41,43,47,53,59,61,67,71,73,79,83,97]

_.includes(primes, 47)

primes.includes(79)

rcdexta

const elements = ["cat", "dog", "bat"]

_.some(elements, el => el.startsWith('c'))

elements.some(el => el.startsWith('c'))