Always good with a great truncate-function!

Really only thing I'd lay my finger on, is the fact, that the string now gets 3 characters longer when truncated.

What I mean is, would it be better to do something like subtracting the length of the ellipsis (...) also, thus making it more compatible with, say, twitter 😇

Also, a way to improve the code maybe:

function truncate(string, limit = 160, ellipsis = "...") {
    limit -= ellipsis.length;

    if (string.length >= limit) {
        return string.substring(0, limit) + ellipsis;
    }

    return string;
}

This way, the result will become:

const t = truncate("Lorem ipsum dolor sit amet", 20);
t // "Lorem ipsum dolor..."
t.length; // 20
"Lorem ipsum dolor sit amet".length; // 26

Length is now always 26 chars, instead of truncating on 26, then adding the ellipsis to the end of the string. Though, this is simply a design question! 🤓

Love the article though!