chestercharles

Blog Posts

Important concepts that Martin Fowler thinks are expressed well by Eric Evan's book, "Domain Driven Design."

https://martinfowler.com/bliki/DomainDrivenDesign.html

Allistair Cockburn's Hexagonal Architecture

https://alistair.cockburn.us/hexagonal-architecture/

chestercharles

let GraphClient: any;
type Order = any;
const graphClient = GraphClient();
const dynamoDbClient = null as any;

// Resolver

export const createOrderResolver = async (_, args, context) => {
  const propertyResult: any = await graphClient.request({
    variables: { id: args.propertyId },

chestercharles

import * as TE from 'fp-ts/lib/TaskEither';
import * as E from 'fp-ts/lib/Either';
import { pipe } from 'fp-ts/lib/function';

// Let's start with a value of 4 wrapped up in a TaskEither
const teFour = TE.right(4);
// The type of teFour is TE.TaskEither<never, number> because TE.right knows there will _never_ be a left value (as of yet)

// We can use TE.map to create a function that will accept a TE and operate on it's value

chestercharles

export function useThrottledCallback(cb, ms) {
  const [callable, setCallable] = useState(true);
  return () => {
    if (callable) {
      cb();
      setCallable(false);
      setTimeout(() => setCallable(true), ms);
    }
  };
}

chestercharles

import React from 'react';
import { View, StyleSheet } from 'react-native';

import LinearGradient from 'react-native-linear-gradient';
import posed from 'react-native-pose';
import { linear } from '@popmotion/easing';
import appTheme from '../../../../appTheme';

export default function SkeletonLoadingIndicator() {
  const PosedShimmerView = posed.View({

chestercharles

       +
     /   \
    *     -
   / \   / \
  +   5 4   -
 / \       / \
9   4     6   3

chestercharles

/**
 * Dijkstra's Algorithmn
 * Finds shortest distance between nodes in a grap
*/

import { Vertex, Edge, Graph } from './Graph.js'

var graph = new Graph();
graph.addVertex('1');
graph.addVertex('2');

chestercharles

/**
 * http://blog.benoitvallon.com/data-structures-in-javascript/the-graph-data-structure/
 */

export interface Vertex {
    vertex: string,
    edges: Edge[]
}

export interface Edge {