Pradeep Singh pradeepsng30

JS learnings

things to note in JS while learning them. putting from my private notes to public gist.

TODO

Learnings

linear combination of integers can form k if k% gcd(elements) is zero.

constraint of equation ax2+2bxy+cy2>0 is b2-ac<0

PRoblem : https://www.codechef.com/SEPT19A/problems/LAPD

kill process at port 8000

kill -9 $(lsof -ti:8000) kill -9 $(lsof -ti:8000,8443)

kill all node processs

killall node

As programmers, we must configure Spring. Spring must know:

Where to start In this case, start with SpringApplication.run() Which classes the container must process In this case, use Annotations How to create instances of classes For Spring annotations, use @Component, @Service, @Bean, etc. For JSR330 annotations, use @Named

	To make this a little more concrete, let’s look at a couple of examples. First off, let’s take a look at some simple cases, starting with some uses of ramda:

	import { merge, add } from 'ramda'

	export const withDefaultConfig = (config) =>
	merge({ path: '.' }, config)

	export const add5 = add(5)
	The first example here is pretty obvious: in withDefaultConfig, merge is used purely as an implementation detail, so it’s safe, and it’s not part of the module’s interface. In add5, the example is a little trickier: the result of add(5) is a partially-applied function created by Ramda, so technically, a Ramda-created value is a part of this module’s interface. However, the contract add5 has with the outside world is simply that it is a JavaScript function that adds five to its argument, and it doesn’t depend on any Ramda-specific functionality, so ramda can safely be a non-peer dependency.

	#In your ~/.gitconfig you can put something like this.
	# git version > 2.13
	# https://stackoverflow.com/questions/8801729/is-it-possible-to-have-different-git-config-for-different-projects/43884702#43884702
	[includeIf "gitdir:~/company_a/"]
	path = .gitconfig-company_a
	[includeIf "gitdir:~/company_b/"]
	path = .gitconfig-company_b

	https://medium.com/@FloSloot/node-js-is-not-single-threaded-88928ada5838



	If you were anything like me, you would’ve come here thinking:

	What the heck is he talking about?! Of course Node.js is single threaded!
	But that’s only partially true! Bare with me.

	TL;DR