abbr.js

const VWL = new Set(["A", "E", "I", "O", "U"]);

function abbr(name) {
    if (name.length < 3)
        return null;
    const NAM = name.toUpperCase();
    const HEA = NAM[0];
    const TAI = Array.from(NAM.substr(1));
    const FLT = TAI.filter(CHR => !VWL.has(CHR)).join("");
    if (FLT.length >= 2)
        return HEA + FLT.substr(0, 2);
    else
        return NAM.substr(0, 3);
}