배우기를 멈추는 사람은 20세건 80세건 늙은 것이다.

Arrays.stream("a", "b", "c").collect(Collectors.joining()); "abc" Arrays.stream("a", "b", "c").collect(Collectors.joining(",")); "a,b,c" [reference] https://www.geeksforgeeks.org/java-8-streams-collectors-joining-method-with-examples/

telnet [아이피주소] [포트번호] [reference] http://www.webmadang.net/community/community.do?action=read&boardid=5001&page=1&seq=17

pip uninstall pycurl export LD_LIBRARY_PATH=/usr/local/opt/curl/lib export LIBRARY_PATH=/usr/local/opt/curl/lib easy_install pycurl [reference] https://github.com/binux/pyspider/issues/472#issuecomment-277174965

https://stackoverflow.com/questions/9044472/how-to-correct-indentation-in-intellij

sudo iptables -I INPUT -p tcp --dport 80 -j ACCEPT sudo iptables -I OUTPUT -p tcp --sport 80 -j ACCEPT [reference] https://freestrokes.tistory.com/44

검증에 지나치게 자원을 소모하지 않게 testOnBorrow 옵션과 testOnReturn 옵션은 false로 설정하고, 오랫동안 대기 상태였던 커넥션이 끊어지는 현상을 막게 testWhileIdle 옵션은 true로 설정하는 것을 추천한다. 참고로 CUBRID는 자체적으로 커넥션을 관리하고 자동으로 다시 연결하도록 구현됐다. DBCP 수준에서 한 번 더 유효성 검사 쿼리를 보내는 것은 추가 비용을 소모할 뿐이므로 CUBRID를 사용할 때는 testWhileIdle 옵션도 false로 설정하기를 권장한다. testWhileIdle=true [reference] https://d2.naver.com/helloworld/5102792

date -d '1 hour ago' "+%m/%d/%Y -%H:%M:%S" [reference] https://stackoverflow.com/questions/5934394/subtract-1-hour-from-date-in-unix-shell-script

wc -c < filename [reference] https://stackoverflow.com/questions/1815329/portable-way-to-get-file-size-in-bytes-in-shell

try: b = a[4] except IndexError: b = 'sss' [reference] https://stackoverflow.com/questions/2574636/getting-a-default-value-on-index-out-of-range-in-python

profile = webdriver.FirefoxProfile() profile.set_preference("browser.cache.disk.enable", False) profile.set_preference("browser.cache.memory.enable", False) profile.set_preference("browser.cache.offline.enable", False) profile.set_preference("network.http.use-cache", False) driver = webdriver.Firefox(profile) [reference] https://stackoverflow.com/questions/18378331/clear-firefox-cache-in-seleniu..

from selenium import webdriver firefox_profile = webdriver.FirefoxProfile() firefox_profile.set_preference("browser.privatebrowsing.autostart", True) driver = webdriver.Firefox(firefox_profile=firefox_profile) [reference] https://stackoverflow.com/questions/27425116/python-start-firefox-with-selenium-in-private-mode

var maxSpeed = { car: 300, bike: 60, motorbike: 200, airplane: 1000, helicopter: 400, rocket: 8 * 60 * 60 }; var sortable = []; for (var vehicle in maxSpeed) { sortable.push([vehicle, maxSpeed[vehicle]]); } sortable.sort(function(a, b) { return a[1] - b[1]; }); //[["bike", 60], ["motorbike", 200], ["car", 300], //["helicopter", 400], ["airplane", 1000], ["rocket", 28800]] [reference] https://sta..

function sortNumber(a, b) { return a - b; } var numArray = [140000, 104, 99]; numArray.sort(sortNumber); console.log(numArray); [reference] https://stackoverflow.com/questions/1063007/how-to-sort-an-array-of-integers-correctly

function onlyUnique(value, index, self) { return self.indexOf(value) === index; } // usage example: var a = ['a', 1, 'a', 2, '1']; var unique = a.filter( onlyUnique ); // returns ['a', 1, 2, '1'] [reference] https://stackoverflow.com/questions/1960473/get-all-unique-values-in-a-javascript-array-remove-duplicates

[item for item in x if item not in y] [reference] https://stackoverflow.com/questions/3428536/python-list-subtraction-operation

list = ["1","10","3","22","23","4","2","200"] list = [int(x) for x in list] list.sort() [reference] https://stackoverflow.com/questions/3426108/how-to-sort-a-list-of-strings-numerically

[출처] https://stackoverflow.com/questions/58620656/a-cookie-associated-with-a-resource-at-http-doubleclick-net-was-set-with-sam

data1 = [1, 2, 3] data2 = [4, 5, 6] data = data1 + data2 print(data) # output : [1, 2, 3, 4, 5, 6] [출처] https://stackoverflow.com/questions/46866105/how-do-i-merge-arrays-in-python

미래의 나에게... MongoDB sudo mongod --smallfiles mongo > Redis redis-server redis-cli >

chrome.tabs.getSelected(null, (tab) => { console.log(tab.id); console.log(tab.url); }); [출처] https://stackoverflow.com/questions/6132018/how-can-i-get-the-current-tab-url-for-chrome-extension