Neil Ding GingerBear

ios

android

 /**
  *
  * Util function to create type safe state management store with useContext and useReducer.
  * The mechanism is described by https://kentcdodds.com/blog/how-to-use-react-context-effectively/
  *
  */
 import React, { useReducer, createContext, useContext } from 'react';
 export type ContextProviderProps = { children: React.ReactNode };

	function notNullOrUndefined<T>(x: T \| null \| undefined): x is T {
	return x !== null && x !== undefined;
	}

	const arr = [1, 2, null, undefined]; // (number \| null \| undefined)[]
	const arrFiltered = arr.filter(notNullOrUndefined); // number[]

	function sampleArray(arr, num) {
	if (arr.length <= num) {
	return arr;
	} else {
	const every = Math.floor(arr.length / num);
	const sampleIndex = Array(num)
	.fill(0)
	.map((_, i) => i * every);

	// keep last element

	FROM node:10-alpine

	# Installs Python 3
	RUN apk add --no-cache python3 && \
	python3 -m ensurepip && \
	rm -r /usr/lib/python*/ensurepip && \
	pip3 install --upgrade pip setuptools && \
	if [ ! -e /usr/bin/pip ]; then ln -s pip3 /usr/bin/pip ; fi && \
	if [[ ! -e /usr/bin/python ]]; then ln -sf /usr/bin/python3 /usr/bin/python; fi && \
	rm -r /root/.cache

	const express = require('express');
	const path = require('path');
	const fs = require('fs');
	const proxy = require('http-proxy-middleware');
	const app = express();
	const proxyConfig = require('./proxy-remote.conf.json');
	const port = 4200;

	const ngBuildPath = path.join(__dirname, 'dist/projectAbc');
	const ngBuildIndex = fs

	type typeA = { a: string };
	type typeB = { b: string };
	type typeAorB = typeA \| typeB;

	// type check for union type
	function isA(foo: typeA \| typeB): foo is typeA {
	return (<typeA>foo).a !== undefined;
	}

	// usage