/* * Write a function strjoin that joins strings with a separator. */ function strjoin() { // code here } console.log(strjoin('.', 'a', 'b', 'c')) // 'a.b.c' console.log(strjoin('-', 'a', 'b', 'c', 'd', 'e', 'f')) // 'a-b-c-d-e-f'

The strjoin function should take a separator as the first argument, followed by any number of strings, and return their concatenation using this separator.

Example implementation in JavaScript using the rest operator and the join method:

function strjoin(separator, ...strings) {
  return strings.join(separator);
}

console.log(strjoin('.', 'a', 'b', 'c')) // 'a.b.c'
console.log(strjoin('-', 'a', 'b', 'c', 'd', 'e', 'f')) // 'a-b-c-d-e-f'