[Java script] Array_아파트 호실찍기

array_apt sample.html

0.00MB

  

<script>

    arr2 = [1,2,3,4,5,6,[1,2,3]]; 

    console.log(arr2); //[1,2,3,4,5,6,Array(3)]

    console.log(arr2[4]); //5

    console.log(arr2[6]); //[1,2,3]

    //3*4 3층짜리 아파트 4호실까지 있는

    arr3=[[,,,,],[,,,,],[,,,,]];

    console.log(arr3); //[Array(4), Array(4), Array(4)]

    arr3 = [[101,102,103,104],[201,202,203,204],[301,302,303,304]]

 

    console.log(arr3);

    console.log(arr3[0]); //[101,102,103,104]

    console.log(arr3[0][3]); //104 <--이중배열

 

    console.log(arr3[1]); //[201,202,203,204]

    

    arr3[1].pop();

    console.log(arr3[1]);

    arr3[1].push(204);

    console.log(arr3[1]);

 

    arr3.forEach(v=>{

        v.forEach(v2=>{

            console.log(v2);

        })

            

    });

    /* 만약 for문으로 한다면

    for(let i=0; i<arr3.length; i++){

        for(let k=0; k<arr3[i].length; k++){

            console.log(arr3[i][k]);

        }

    } */

 

    </script>