paf31

This blog post series has moved here.

You might also be interested in the 2016 version.

paf31

module Main where

import Debug.Trace

import Data.Tuple
import Data.Either
import Data.Lazy

class Memo a where
  memo :: forall r. (a -> r) -> a -> Lazy r

EmmanuelOga

// http://stackoverflow.com/questions/52353/in-java-what-is-the-best-way-to-determine-the-size-of-an-object
import java.lang.instrument.Instrumentation;

public class ObjectSizeFetcher {
    private static Instrumentation instrumentation;

    public static void premain(String args, Instrumentation inst) {
        instrumentation = inst;
    }

vasanthk

System Design Cheatsheet

Picking the right architecture = Picking the right battles + Managing trade-offs

Basic Steps

1. Clarify and agree on the scope of the system

• User cases (description of sequences of events that, taken together, lead to a system doing something useful)
  • Who is going to use it?
  • How are they going to use it?

hernamesbarbara

Principles of Adult Behavior

1. Be patient. No matter what.
2. Don’t badmouth: Assign responsibility, not blame. Say nothing of another you wouldn’t say to him.
3. Never assume the motives of others are, to them, less noble than yours are to you.
4. Expand your sense of the possible.
5. Don’t trouble yourself with matters you truly cannot change.
6. Expect no more of anyone than you can deliver yourself.
7. Tolerate ambiguity.
8. Laugh at yourself frequently.

rondy

FWIW: I (@rondy) am not the creator of the content shared here, which is an excerpt from Edmond Lau's book. I simply copied and pasted it from another location and saved it as a personal note, before it gained popularity on news.ycombinator.com. Unfortunately, I cannot recall the exact origin of the original source, nor was I able to find the author's name, so I am can't provide the appropriate credits.

---

Effective Engineer - Notes

• By Edmond Lau
• Highly Recommended 👍
• http://www.theeffectiveengineer.com/

What's an Effective Engineer?

hgoldstein95

data Regex
  = Empty
  | Single Char
  | Alt Regex
        Regex
  | Con Regex
        Regex
  | Star Regex
  deriving (Show)

mfikes

If you are curious about the types inferred by ClojureScript, it is easy to get some insight using a macro:

(defmacro inferred-type [form]
  `'~(cljs.analyzer/infer-tag &env
       (cljs.analyzer/no-warn (cljs.analyzer/analyze &env form))))

This is the kind of dev-time macro you could refer using the new user.cljs feature.

EmmanuelOga

import it.unimi.dsi.fastutil.objects.ObjectAVLTreeSet

data class Quad(val s: String = "", val p: String = "", val o: Comparable<Any>? = null, val c: String = "") :
    Comparable<Quad> {

    override fun compareTo(other: Quad): Int = compareValuesBy(this, other, Quad::s, Quad::p, Quad::o, Quad::c)

    override fun toString(): String = "Q<S=$s P=$p O=$o C=$c>"
}

gnat

🐘 Postgres Standalone

Why?

• Localize your database into one single folder of your choosing.
• No sudo / root requirement.
• Run multiple Postgres at the same time on the same machine- Full bare metal performance.
• Postgres is a great starter before moving to "slow single machine but horizontal scale": CockroachDB, ScyllaDB, etc.

Compile