javascript

{
    ['j', 'a', 'v', 'a', 's', 'c', 'r', 'i', 'p', 't'].slice(0);     //['j', 'a', 'v','a', 's', 'c', 'r', 'i', 'p', 't']
    ['j', 'a', 'v', 'a', 's', 'c', 'r', 'i', 'p', 't'].slice(1);     //[ 'a', 'v', 's', 'c', 'r', 'i', 'p', 't']
    ['j', 'a', 'v', 'a', 's', 'c', 'r', 'i', 'p', 't'].slice(2);     //['v', 's', 'c', 'r', 'i', 'p', 't']
    ['j', 'a', 'v', 'a', 's', 'c', 'r', 'i', 'p', 't'].slice(0, 1);  //['j']
    ['j', 'a', 'v', 'a', 's', 'c', 'r', 'i', 'p', 't'].slice(1, 2);  //['a']
    ['j', 'a', 'v', 'a', 's', 'c', 'r', 'i', 'p', 't'].slice(0, 2);  //['j', 'a']
    ['j', 'a', 'v', 'a', 's', 'c', 'r', 'i', 'p', 't'].slice(0, 3);  //['j', 'a', 'v']
    ['j', 'a', 'v', 'a', 's', 'c', 'r', 'i', 'p', 't'].slice(5, 10);  //['c', 'r', 'i','p','t']
    ['j', 'a', 'v', 'a', 's', 'c', 'r', 'i', 'p', 't'].slice(5, -1);  //['c', 'r', 'i','p']
    ['j', 'a', 'v', 'a', 's', 'c', 'r', 'i', 'p', 't'].slice(5, -2);  //['c', 'r', 'i',]
    ['j', 'a', 'v', 'a', 's', 'c', 'r', 'i', 'p', 't'].slice(-1);     //['t']
    ['j', 'a', 'v', 'a', 's', 'c', 'r', 'i', 'p', 't'].slice(-2);     //['p','t']
    ['j', 'a', 'v', 'a', 's', 'c', 'r', 'i', 'p', 't'].slice(-3);     //['i','p','t']
    ['j', 'a', 'v', 'a', 's', 'c', 'r', 'i', 'p', 't'].slice(-3, -1);     //['i','p']
    ['j', 'a', 'v', 'a', 's', 'c', 'r', 'i', 'p', 't'].slice(-3, -2);     //['i']

{
    const arrNum1 = [100,200,300,400,500];
    const result1 = arrNum1.splice(1);

        console.log(result1);    //[200,300,400,500] : 100이 지워진 값이 나온다
        console.log(arrNum1);    //[100]  : 배열안의 위치 값 
    
    const arrNum2 = [100,200,300,400,500];
    const result2 = arrNum2.splice(1, 2);

        console.log(result2)    //[200,300] : 원본 파일이 변한다.
        console.log(arrNum2)    //[100,400,500]

    const arrNum3 = [100,200,300,400,500];
    const result3 = arrNum3.splice(1, 4);

        console.log(result3)    //[200,300,400,500]
        console.log(arrNum3)    //[100]

    const arrNum4 = [100,200,300,400,500];
    const result4 = arrNum4.splice(1, 2, "javascript");

        console.log(result4)    //[200,300]
        console.log(arrNum4)    //[100, "javascript", 400, 500]

    const arrNum5 = [100,200,300,400,500];
    const result5 = arrNum5.splice(1, 0, "javascript");

        console.log(result5)    //[]
        console.log(arrNum5)    //[100, "javascript", 200, 300, 400, 500]

    const arrNum6 = [100,200,300,400,500];
    const result6 = arrNum6.splice(0, 4, "javascript");

        console.log(result6)    //[100,200,300,400]
        console.log(arrNum6)    //["javascript",500]

    const arrNum7 = [100,200,300,400,500];
    const result7 = arrNum7.splice(2, 2, "javascript");

        console.log(result7)    //[300,400]
        console.log(arrNum7)    //[100,200,"javascript",500]

    const arrNum8 = [100,200,300,400,500];
    const result8 = arrNum8.splice(-2, 2, "javascript");

        console.log(result8)    //[400,500]
        console.log(arrNum8)    //[100,200,300"javascript"]