Javascript Steno Keyboard

const stenotype = "STKPWHRAO*EUFRPBLGTSDZ";
const stenoMap = "SSTKPWHRAO****EUFRPBLGTSDZ";
const keyboard = "QAWSEDRFCVTYGHNMUJIKOLP;['";

var keysDown = [];

window.onkeydown = function(e) {console.log(e.code)}


function findIn(val, arr) {
    let index = 0;
    let found = arr.find(function (curVal) {
        index++;
        return curVal == val;
    });

    if (found) {
        return index - 1;
    }
}

function isIn(val, arr) {
    return arr.find(function (curVal) {
        return curVal == val;
    }) != undefined;
}