Strings containing digits in JavaScript

Suppose we have a string containing only digits:

let test = '12345'; // string with digits

Let's find, for example, the sum of its first and second characters:

let test = '12345'; alert(test[0] + test[1]); // shows '12' - concatenates like strings

As you can see, the characters in our string are also strings and are concatenated as strings. Let's say we want to sum them as numbers. We use the function Number for this aim:

let test = '12345'; // string alert(Number(test[0]) + Number(test[1])); // shows 3

Given the string '12345'. Find the sum of the digits of this string.

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