Typescript loop through string with index and value

Question

I want to loop through a string and I want to have both the index and the character at this index. I know I could use a simple for loop for this, but I thought some of the newer features of Javascript/Typescript might be more elegant, so I tried this:

for (const [i, character] of Object.entries('Hello Stackoverflow')) {
    console.log(i);
    console.log(typeof(i));
    console.log(character);
}

Amazingly this works, however even though i counts up, it is a string. So for example this doesn't work:

'other string'.charAt(i)

I'm new at Typescript, so my questions are:

• Why is i a string and not a number?
• Is there a simpler / more elegant way to do this?