dvliman

$: (Dollar Colon) is basically a shorthand version of $LOAD_PATH. $: contains an array of paths that your script will search through when using require.
$0 (Dollar Zero) contains the name of the ruby program being run. This is typically the script name.
$* (Dollar Splat) is basically shorthand for ARGV. $* contains the command line arguments that were passed to the script.
$? (Dollar Question Mark) returns the exit status of the last child process to finish.
$$ (Dollar Dollar) returns the process number of the program currently being ran.
$~ (Dollar Tilde) contains the MatchData from the previous successful pattern match.
$1, $2, $3, $4 etc represent the content of the previous successful pattern match.
$& (Dollar Ampersand) contains the matched string from the previous successful pattern match.
$+ (Dollar Plus) contains the last match from the previous successful pattern match.
$` (Dollar Backtick) contains the string before the actual matched string of the previous successful pattern match.

jessejanderson

Community

• Elixir Slack Group

Cheatsheets

• GenServer Cheatsheet by Benjamin Tan Wei Hao

Books

enzinier

#!/bin/sh
# Userland mode (~$USER/), (~/).

# ~/.fonts is now deprecated and that
#FONT_HOME=~/.fonts
# ~/.local/share/fonts should be used instead
FONT_HOME=~/.local/share/fonts

echo "installing fonts at $PWD to $FONT_HOME"
mkdir -p "$FONT_HOME/adobe-fonts/source-code-pro"

wilon

普通模式

	命令	说明 + 示例
	ds	删除括号
例	ds "	"Hello world!" => Hello world!
	cs	替换括号
例	cs "(	"Hello world!" => (Hello world!)
	cS	替换括号，括号内文本做新一行
例	cS "{	"Hello world!" => {     Hello world! }

stevencch99

function primeString(s, count = 1) {
  // 如果字串中有重複的模式，最少也會重複 1 次，故迭代超過字串長度的一半還沒找到就不用找了
  if(count > s.length / 2) { return true }
  
  // 每次迭代將字串的一小塊，設定為分割陣列的符號 chunk
  let chunk = s.slice(0, count)
  // 被 chunk 切過的部分會變成陣列中的空元素，此行判斷是不是能夠將陣列切成重複的小塊
  // 如果切完後全部的陣列元素都是空的，代表字串被 chunk 整除，恭喜找到規律。
  let grouped = s.split(chunk).every(i => i === '')
  

stevencch99

#!/bin/sh
# Userland mode (~$USER/), (~/).

# ~/.fonts is now deprecated and that
#FONT_HOME=~/.fonts
# ~/.local/share/fonts should be used instead
FONT_HOME=~/.local/share/fonts

echo "installing fonts at $PWD to $FONT_HOME"
mkdir -p "$FONT_HOME/adobe-fonts/source-code-pro"

PJUllrich

Big-O Time Complexities for Elixir data structures

Map [1]

Operation	Time Complexity
Access	O(log n)
Search	O(log n)
Insertion	O(n) for <= 32 elements, O(log n) for > 32 elements [2]
Deletion	O(n) for <= 32 elements, O(log n) for > 32 elements