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Comparison operator & Boolean 연산자

===:동등연산자

조건문 Conditional Statements

if-true

if-false

로직 한줄 정렬. 아래 두개의 로직은 같다

false & true 정의:

// false: 0, -0 '', null, undefined

// true: -1, 'hello', 'false'

Program:
  

1. String concatenation

2. Numeric operators

3. Increment and decrement operators

4. Assignment operators

5. Comparison operators

6. Logical operators: ||(or), &&(and),!(not)

7. Equality

8. Conditional operators: if

9. Ternary operator: ?

10. Switch statement

  // use for multiple if checks
  // use for enum-like value check
  // use for multiple type checks in TS
  
    
  

11. Loops

  // 블록을 먼저 실행하고 싶다면 do while을 써야되고 
  // 조건이 맞을때만 while쓰면된다
  // while loop, while the condition is truthy,
  // body code is executed. 

// for loop, for(begin; condition; step)
  
        

Break, continue;

// Q1. iterate from 0 to 10 and print only even numbers(use continue)

    <script>
  for (let z = 0; z < 11; z++){
    if (i % 2 === 0 ){
      document.write(`Q1:${z}, `);
    }
  }

  // Q2. iterate from 0 to 10 and print numbers untilreaching 8(use break)
  for (let z = 0; z < 11; z++){
    if(i > 8){
      break;
    }
    document.write(`Q2:${z}`);
  }  
  //출력: 
  Q1:0, Q1:2, Q1:4, Q1:6, Q1:8, Q1:10, Q2:0Q2:1Q2:2Q2:3Q2:4Q2:5Q2:6Q2:7Q2:8
      </script>