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

{ 
    ['java','script','refer','ence'].splice(2);                    //['refer','ence']
    ['java','script','refer','ence'].splice(3);                    //['ence']
    ['java','script','refer','ence'].splice(1, 2);                 //['script','refer']
    ['java','script','refer','ence'].splice(1, 3);                 //['script','refer','ence']


    const str = ['java','script','refer','ence'];
    const result = str.splice(1, 3, "react");
    console.log(str);           //['java', 'react']
    console.log(result);        //['script', 'refer', 'ence']


    const arrNum1 = [100, 200, 300, 400, 500];
    const result1 = arrNum1.splice(1);                //0부터 1개의배열을 삭제
    console.log(result1);                            //[100] 삭제한 값
    console.log(arrNum1);                            //[200, 300, 400, 500] 결과값


    const arrNum2 = [100, 200, 300, 400, 500];
    const result2 = arrNum2.splice(1, 2);            //1부터 2개의배열을 삭제제
    console.log(result2);                            //[200, 300] 삭제한 값
    console.log(arrNum2);                            //[100, 400, 500] 결과값


    const arrNum3 = [100, 200, 300, 400, 500];
    const result3 = arrNum3.splice(1, 4);            //1부터 4개의배열을 삭제
    console.log(result3);                            //[200, 300, 400, 500] 삭제한 값
    console.log(arrNum3);                            //[100] 결과값


    const arrNum4 = [100, 200, 300, 400, 500];
    const result4 = arrNum4.splice(1, 2, "javascript");         //1부터 2개의배열을 삭제
    console.log(result4);                                       //[200, 300] 삭제한 값
    console.log(arrNum4);                                       //[100, 'javascript', 400, 500] 결과값


    const arrNum5 = [100, 200, 300, 400, 500];
    const result5 = arrNum5.splice(1, 0, "javascript");          //1부터 0개의배열을 삭제
    console.log(result5);                                        //[] 삭제한 값
    console.log(arrNum5);                                       //[100, 'javascript', 200, 300, 400, 500] 결과값


    const arrNum6 = [100, 200, 300, 400, 500];
    const result6 = arrNum6.splice(0, 4, "javascript");        //0부터 4개의배열을 삭제
    console.log(result6);                                      //[100, 200, 300, 400] 삭제한 값
    console.log(arrNum6);                                      //['javascript', 500] 결과값


    const arrNum7 = [100, 200, 300, 400, 500];
    const result7 = arrNum7.splice(2, 2, "javascript", "react");        //2부터 2개의배열을 삭제
    console.log(result7);                                                //[300, 400] 삭제한 값
    console.log(arrNum7);                                               //[100, 200, 'javascript', 'react', 500] 결과값


    const arrNum8 = [100, 200, 300, 400, 500];
    const result8 = arrNum8.splice(-2, 2, "javascript");            //-라서 뒤에서부터 2부터 2개의배열을 삭제
    console.log(result8);                                           //[400, 500] 삭제한 값
    console.log(arrNum8);                                           //[100, 200, 300, 'javascript'] 결과값
}