harryhan24

import { AbstractControl, FormArray, FormGroup } from '@angular/forms';
import { map, toPairs, fromPairs, differenceWith, isEqual, isNull, isUndefined } from 'lodash';
import { Observable, OperatorFunction, defer, empty, of, merge, pipe } from 'rxjs';
import { distinctUntilChanged, filter, map, shareReplay, pairwise } from 'rxjs/operators';

/**
 * Convenience RxJS operator that filters out undefined & null and modifies the downstream type
 * appropriately.
 */
export function exists<T>(): OperatorFunction<T | undefined | null, T> {

harryhan24

import {
  DynamoDBClient,
  PutItemCommand,
  GetItemCommand,
  UpdateItemCommand,
  DeleteItemCommand,
} from '@aws-sdk/client-dynamodb';
import {
  marshall,
  unmarshall

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import { APIGatewayProxyEventV2, APIGatewayProxyResultV2 } from "aws-lambda";
import { DynamoDB, PutItemInput } from '@aws-sdk/client-dynamodb'
import { marshall } from '@aws-sdk/util-dynamodb'
import { v4 as uuid } from 'uuid'

interface TodoInput {
    id?: string
    title: string
    done: boolean 
}

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const initialData = {
	servers: [
		{
			url: 'https://1.example.com/',
			title: 'Server 1',
			online: null,
		},
		{
			url: 'https://2.example.com/',
			title: 'Server 2',

harryhan24

Flutter

A quick cheatsheet of useful snippet for Flutter

Widget

A widget is the basic type of controller in Flutter Material. There are two type of basic Widget we can extend our classes: StatefulWidget or StatelessWidget.

Stateful

StatefulWidget are all the widget that interally have a dynamic value that can change during usage. It can receive an input value in the constructor or reference to functions. You need to create two classes like:

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// Get AWS Congito access token using node-fetch and axios
const axios = require('axios');
const fetch = require('node-fetch');
const url = 'https://REPLACE_ME.auth.ap-southeast-2.amazoncognito.com/oauth2/token';
const clientId = 'REPLACE_ME';
const clientSecret = 'REPLACE_ME';
const body = `client_id=${clientId}&client_secret=${clientSecret}&grant_type=client_credentials`

// with node-fetch

harryhan24

Setting up Docker with user namespaces on CentOS 7.4

The procedure below has been tested on a Digital Ocean VM with CentOS 7.4

# Install docker from RHEL’s standard repos
yum install -y docker

#
# We’ll activate the ‘user namespaces’ feature that defends against

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" VIM SETTINGS <(
" 搜索忽略大小写
set ignorecase
" 高亮搜索
set hlsearch
" 显示行号和列号
set ruler
" 不显示状态行
" set laststatus=0

harryhan24

# vim:ft=zsh ts=2 sw=2 sts=2
#
# agnoster's Theme - https://gist.github.com/3712874
# A Powerline-inspired theme for ZSH
#
# # README
#
# In order for this theme to render correctly, you will need a
# [Powerline-patched font](https://github.com/Lokaltog/powerline-fonts).
# Make sure you have a recent version: the code points that Powerline

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<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
        xmlns:tools="http://schemas.android.com/tools"
        package="...">

    <uses-permission android:name="android.permission.INTERNET" />


    <application
            android:name="..."