table filter

function solve(arr,sortString){
let matrix=arr;
const sortingArr=sortString.split(' ');

let command=sortingArr[0];

switch(command){

    case "hide":
    hide(matrix);
    break;

    case "sort":
     matrix= Sort(matrix);
    break;

    case "filter":
    filter(matrix);
    break;
}
for (const row of matrix) {
    console.log(row.join(' | '));
}
function hide(arr){
    let headerToHide=sortingArr[1];
    let index=arr[0].indexOf(headerToHide);
    for (let line of matrix) {
        line.splice(index,1);
    }
}

function Sort(arr){
    let headerTofilterOn=sortingArr[1];
    let index=arr[0].indexOf(headerTofilterOn);
    let ordered=arr.sort((a,b) => a[index]=== headerTofilterOn ? -1 : b[index] === headerTofilterOn ? 1 : a[index].localeCompare(b[index]));

    return ordered;
}

function filter(arr){
    let headerTofilterOn=sortingArr[1];
    let index=arr[0].indexOf(headerTofilterOn);
    let valueToFilterOn=sortingArr[2];
    for(let i = 1; i < arr.length; i++) {
        let contains=arr[i][index]===valueToFilterOn;
        if(contains===false){
            arr.splice(i,1);
            i--;
        }
    }
}
}