Array - Totale array

const fruits = ["Banana", "Orange", "Apple", "Mango"];
fruits.length; // Returns 4

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accesso array
const fruits = ["Banana", "Orange", "Apple", "Mango"];
fruits[fruits.length - 1]; // Returns "Mango"

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const fruits = ["Banana", "Orange", "Apple", "Mango"];
let fLen = fruits.length;

text = "<ul>";
for (let i = 0; i < fLen; i++) {
text += "<li>" + fruits[i] + "</li>";
}
text += "</ul>";

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Puoi anche utilizzare la Array.forEach()funzione:

Esempio
const fruits = ["Banana", "Orange", "Apple", "Mango"];

let text = "<ul>";
fruits.forEach(myFunction);
text += "</ul>";

function myFunction(value) {
text += "<li>" + value + "</li>";
}


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