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','a','s','c','r','i','p','t']
    ['j','a','v','a','s','c','r','i','p','t'].slice(2);         //['v','a','s','c','r','i','p','t']
    ['j','a','v','a','s','c','r','i','p','t'].slice(3);         //['a','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, 3);      //[]
    ['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']
    ['j','a','v','a','s','c','r','i','p','t'].slice(-3, -4);    //[]
}

{
    //arrNum1은 나머지 요소 + 추가된 요소
    //result1은 삭제된 요소

    //01.
    const arrNum1 = [100, 200, 300, 400, 500];
    const result1 = arrNum1.splice(1);

    console.log(arrNum1);         //[100]    //나머지 요소 
    console.log(result1);         //[200, 300, 400, 500] //삭제된 요소
    
    //02.
    const arrNum2 = [100, 200, 300, 400, 500];
    const result2 = arrNum2.splice(1, 2);

    console.log(arrNum2);   //[100, 400, 500]
    console.log(result2);   //[200, 300]

    //03.
    const arrNum3 = [100, 200, 300, 400, 500];
    const result3 = arrNum3.splice(1, 4);

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

    //04.
    const arrNum4 = [100, 200, 300, 400, 500];
    const result4 = arrNum4.splice(1, 2, "javascript");

    console.log(arrNum4);   //[100, 'javascript', 400, 500]  //나머지 요소 + 추가된 요소
    console.log(result4);   //[200, 300]     //삭제된 요소

    //05.
    const arrNum5 = [100, 200, 300, 400, 500];
    const result5 = arrNum5.splice(1, 0, "javascript");

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

    //06.
    const arrNum6 = [100, 200, 300, 400, 500];
    const result6 = arrNum6.splice(0, 4, "javascript");

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

    //07.
    const arrNum7 = [100, 200, 300, 400, 500];
    const result7 = arrNum7.splice(2, 2, "javascript", "react");

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

    //08.
    const arrNum8 = [100, 200, 300, 400, 500];
    const result8 = arrNum8.splice(-2, 2, "javascript");

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