javascript solution

function designerPdfViewer(h, word) {

let arrayWordsAlphabetics = ['a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'k', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z'];

let arrayNumbers = h;
let stringWord = word;

let arrayNumbersFiltered = [];
let maxNumber = 0;
let result = 0;

for(let i in arrayNumbers) {

    for(let j in arrayWordsAlphabetics) {

        for(let k in stringWord) {

            if(stringWord[k] === arrayWordsAlphabetics[j] && i === j) {
                arrayNumbersFiltered.push(arrayNumbers[j]);
                maxNumber = Math.max(...arrayNumbersFiltered);
                result = maxNumber * stringWord.length;
            }
        }
    }
}

return result;

}

Javascript Solution :

function designerPdfViewer(h, word) {
    
    let maxHeight = 0
    
    for(let i=0; i < word.length; i++){
        let tempHeight = h[word[i].toUpperCase().charCodeAt(0) - 64 - 1]
        maxHeight = tempHeight > maxHeight ? tempHeight : maxHeight;
    }
    return maxHeight * word.length;

}

string="abcdefghijklmnopqrstuvwxyz"
maxheight=0

for item in word:
        pos=string.index(item)
        height=h[pos]
        maxheight=max(height,maxheight)

area=maxheight*len(word)
return area