sobstel

// @flow
import React, { Component } from 'react';
import _ from 'lodash';
import createStackNavigator from './createStackNavigator';

type Props = {
  navigation: *,
};

const DEFAULT_CONFIG = {

sobstel

// same arg type and return type
withUID<T>(obj: T)

// "extends" helps providing some constraints
// eg <T extends object>
withUID({a: 1}) // valid
withUID("wrong way") // NOT valid

// default value type (string)
A<T=string> { name: T }

sobstel

class Router
  Route = Struct.new(:pattern, :block)

  class RouteSet
    def on(pattern, &block)
      Router.routes.push Route.new(pattern, block)
    end
  end

  @routes = []

sobstel

❯ react-native run-ios --simulator="iPhone 7"

Found Xcode workspace Nabobil.xcworkspace

Could not find iPhone 7 simulator

Error: Could not find iPhone 7 simulator
    at resolve (...)
  
sed -i '' 's/startsWith/includes/g' node_modules/react-native/local-cli/runIOS/findMatchingSimulator.js

sobstel

10 ways to have a better conversation (by Celeste Headlee)

1. Don't multitask (be present, be in that moment)
2. Don't pontificate
3. Use open-ended questions
4. Go with the flow
5. If you don't know, say that you don't know
6. Don't equate your experience with theirs (it's never the same, all experiences are individual)
7. Try not to repeat yourself
8. Stay out of the weeds (people don't care about details)

sobstel

# error: Build input file cannot be found: '/Users/sobstel/Projects/nabobil/nabobil-mobile/node_modules/react-native/third-party/double-conversion-1.1.6/src/diy-fp.cc'

cd node_modules/react-native/scripts && ./ios-install-third-party.sh && cd ../../../
cd node_modules/react-native/third-party/glog-0.3.5/ && ../../scripts/ios-configure-glog.sh && cd ../../../../

sobstel

MVP cheatsheet

The goal

To prove there is product market fit while taking on the least amount of risk possible.

Steps

1. Define the problem your product solves and what makes your product unique

sobstel

class Data < ApplicationRecord
  class << self
    def bulk_upsert(values)
      transaction do
        values.uniq { |v| v[:key] }.each_slice(1000) do |values_slice|
          connection.exec_query <<-SQL.squish
            INSERT INTO #{table_name}(#{upsert_columns.join(', ')})
              VALUES #{upsert_values_statement(values_slice)}
              ON CONFLICT(key)
                DO UPDATE SET

sobstel

Effective Ruby

#1 (Almost) Everything is true

• Every value is true except false and nil.
• The number zero is true in Ruby.
• Use the nil? method to differentiate between false and nil.

#2 All objects could be nil

sobstel

# taken from https://mrbrdo.wordpress.com/2013/09/25/manually-preloading-associations-in-rails-using-custom-scopessql/

# collection association e.g. has_many

owners = People.all
association_name = :photos

owners.each do |owner|
  records = Array(whatever_you_want)