Abbreviate a Two Word Name (8kyu) [JavaScript]

Chek kata on Codewars

Description:

Write a function to convert a name into initials. This kata strictly takes two words with one space in between them.

The output should be two capital letters with a dot separating them.

It should look like this:

Sam Harris => S.H

Patrick Feeney => P.F

Loop

function abbrevName(name){
    const answer = [name[0]]
    for(let i = 0; i < name.length; i++) {
        if(name[i] === " ") {
            answer.push(name[i + 1]);
        }
    }
    return answer.map(el => el.toUpperCase()).join(".")
}

Array

function abbrevName(name){
   const newArray = name.split(" ")
   return (newArray[0][0] + "." + newArray[1][0]).toUpperCase()
}

Map

function abbrevName(name){
   return name.split(" ").map(el => el[0].toUpperCase()).join(".")
}

Substring

function abbrevName(name){
    return name.split(" ").map(el => el.substring(0,1).toUpperCase()).join(".")
}

regex

function abbrevName(name){
   return name.match(/\b(\w)/g).toString().toUpperCase().replace(',', '.');
}