lilactown

/**
 * Making promises
 */
let okPromise = Js.Promise.make((~resolve, ~reject as _) => [@bs] resolve("ok"));

/* Simpler promise creation for static values */
Js.Promise.resolve("easy");

Js.Promise.reject(Invalid_argument("too easy"));

nepsilon

3 hidden Python tips 🐍

Hidden from beginner tutorials and seldom found in books.

1. You can multiply a string to repeated it:

>>> "HOOLI-"*2
'HOOLI-HOOLI-'

sergiotapia

import (
    "crypto/md5"
    "encoding/hex"
)

func GetMD5Hash(text string) string {
    hasher := md5.New()
    hasher.Write([]byte(text))
    return hex.EncodeToString(hasher.Sum(nil))
}

electronut

################################################################################
# showdata.py
#
# Display analog data from Arduino using Python (matplotlib)
# 
# electronut.in
#
################################################################################

import sys, serial

hellerbarde

Latency numbers every programmer should know

L1 cache reference ......................... 0.5 ns
Branch mispredict ............................ 5 ns
L2 cache reference ........................... 7 ns
Mutex lock/unlock ........................... 25 ns
Main memory reference ...................... 100 ns             
Compress 1K bytes with Zippy ............. 3,000 ns  =   3 µs
Send 2K bytes over 1 Gbps network ....... 20,000 ns  =  20 µs
SSD random read ........................ 150,000 ns  = 150 µs

Read 1 MB sequentially from memory ..... 250,000 ns = 250 µs

mbostock

license: gpl-3.0