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- print to Console System.out.pirntln("~string~") - variables String // for letters int // for numbers double // for decimal num //without any quotes for variable-name data-type variable-name; variable-name = value; or data-type variable-name=value; - calculation x = x + 1; -> x +=1; -> x++; - camelCase use a variable-name camel // fine camelCase //fine camel_case // is used a // not descriptive..

- running JS code console.log(~~); " ~~ " or ' ~~ ' - variable let variableName = value; - constants const constantName = value; // it can not be changed - templete ` ~~~ ${constants or variables}` // can embed in strings // must put the entire in backticks, ` - if statements if(condition1) { // when condition1 is true } else if (condition2) { // when the condition1 is false // and condition2 is..

- query SELECT columnName, … FROM tableName; // ; at the very end SELECT * // selects all columns SELECT DISTINCT(column_name) // no duplicate rows - WHERE WHERE category = "category_a" WHERE category = | > |

HTML ~A~ : need an "opening tag" and a "closing tag" - Heading Tags to (heading) : 1 is the largest and 6 is the smallest - Paragraph Tags (paragraph) - Comment - Link Tags (anchor) (hypertext reference) - Image Tags (no closing tag needed) - Lists (list) (unordered list)

python - print string print('Hello world') print("Hello world") - comment # ~A~ - difference between Strings and Integers print(1+2) -> 3 print('1+2') -> 1+2 - varible varible_name = value name = '~A~' number = 0 print(name) -> ~A~ print('number') -> number -update value of a variable x = 1 : overwrite x = 2 :calculation x = x+2 (standard) x += 2 (shorthand) // 몫 % 나머지 / 나누기 - String Concatenati..

* 다음의 글은 2019년 10월에 겪은 일로 타 블로그에 올린바 있습니다. Git $ git init add file $ git add file_name commmit file $ git commit -m "Create index.html" remote $ git remote add origin http://~~ upload $ git push origin master download $ git pull origin master -> add -> commit -> push -> pull recognize modified files $ git status see the content changes $ git diff code before : red code after : greens files that ..