Get initials of names in Javascript

I have Person and group names

> Person :

Robert Smith
David Smith
James Johnson
William

if i use this code

if(Name.split(",").length === 1)
  return Name.trim().split(" ").map(x => x[0]).reduce((acc, curr) => acc + curr) 
else 
  return ''

Output is

1. RS
2. DS
3. JJ

but in my second scenario there are sets of names

like

1. Robert Smith,David Smith
2. James Johnson,Robert Smith

in this case if any comma is found i want to return RD in first case and in second case JS

Your question is not clear, I assume you need to get the initial of the first and last name in the first scenario and get the initial of each name in the second scenario.

Check whether the following solution helps,

<!-- begin snippet: js hide: false console: true babel: false -->

<!-- language: lang-js -->

const scenario1 = "Robert Smith";
const scenario2 = "Robert Smith,David Smith";

function getInitial(data) {

  const chunks = data.split(",");
  
  if ( chunks.length > 1) {
    const initials = [];
    chunks.forEach(chunk => initials.push(chunk[0]));
    return initials.join('');
  } else {
    const [fname, lname] = chunks[0].split(' ');
    return `${fname[0]}${(lname ? lname[0] : '')}`;
  }

}

console.log(getInitial(scenario1))
console.log(getInitial(scenario2))

<!-- end snippet -->