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코테 1단계 - Coggle Diagram

- - - - arr.filter(x => x > 0)
  - - - arr.reduce((a,b)=>a+b,0)
  - - - arr.map(x => x * 2)
  - - - arr.push(4)
  - - - arr.pop()
  - - - arr.slice(0,2)
- - - - "a,b".split(",")
  - - - "abc".includes("a")
  - - - ["a","b"].join("-")
- - - - new Map()
        
        추가
        
        set(key, value)
        
        값 가져오기
        
        get(key)
        
        존재 여부
        
        has(key)
        
        삭제
        
        delete(key)
        
        전체 삭제
        
        clear()
  - - - new Set([1,1,2] ) -> (1,2)