Hello there!, I finally made my solution of ‘Inventory update’ work but it throws TypeError: this is undefined. The code does what is intended as all seems to work fine in Runkit and all the green marks appear but I still don´t get the challenge approved. I tried solving it by just defining pos with let and return an array but that doesn’t work lol
function updateInventory(arr1, arr2) {
let newObj = {};
for(let x = 0, len = arr2.length;x < len;x++) {
let isInCurrentInv = arr1.some((subArr, index) => {
this.pos = index;
return subArr[1] === arr2[x][1];
});
if(isInCurrentInv) {
newObj[arr2[x][1].toLowerCase()] = arr2[x][0] + arr1[pos][0];
} else {
newObj[arr2[x][1].toLowerCase()] = arr2[x][0];
}
}
for(let y = 0, len = arr1.length;y < len;y++) {
if(!newObj.hasOwnProperty(arr1[y][1].toLowerCase())) {
newObj[arr1[y][1].toLowerCase()] = arr1[y][0];
}
}
let keys = Object.keys(newObj);
keys = keys.sort();
let newArr = [];
for(let z = 0, len = keys.length;z < len;z++) {
newArr.push([newObj[keys[z]], keys[z].replace(/\b\w/g, char => char.toUpperCase())]);
}
return newArr;
}