None of the string methods modify this
– they always return fresh strings.
-
charAt(pos: number): string
ES1Returns the character at index
pos
, as a string (JavaScript does not have a datatype for characters).str[i]
is equivalent tostr.charAt(i)
and more concise (caveat: may not work on old engines).
In this demonstration I will show you how to read data in Angular2 final release before application startup. You can use it to read configuration files like you do in other languages like Java, Python, Ruby, Php.
This is how the demonstration will load data:
a) It will read an env file named 'env.json'. This file indicates what is the current working environment. Options are: 'production' and 'development';
b) It will read a config JSON file based on what is found in env file. If env is "production", the file is 'config.production.json'. If env is "development", the file is 'config.development.json'.
Prerequisites : the letsencrypt CLI tool
This method allows your to generate and renew your Lets Encrypt certificates with 1 command. This is easily automatable to renew each 60 days, as advised.
You need nginx to answer on port 80 on all the domains you want a certificate for. Then you need to serve the challenge used by letsencrypt on /.well-known/acme-challenge
.
Then we invoke the letsencrypt command, telling the tool to write the challenge files in the directory we used as a root in the nginx configuration.
I redirect all HTTP requests on HTTPS, so my nginx config looks like :
server {
import express from "express"; | |
/** | |
* Takes a route handling function and returns a function | |
* that wraps it after first checking that the strings in | |
* `reserved` are not part of `req.body`. Used for ensuring | |
* create and update requests do not overwrite server-generated | |
* values. | |
*/ | |
function checkReservedParams(routeHandler, ...reserved) { |
# to generate your dhparam.pem file, run in the terminal | |
openssl dhparam -out /etc/nginx/ssl/dhparam.pem 2048 |