# 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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