Remove all occurrences except last?

Question

I want to remove all occurrences of substring = . in a string except the last one.

E.G:

1.2.3.4

should become:

Answer 1

A replaceAllButLast function is more useful than a removeAllButLast function. When you want to remove just replace with an empty string:

function replaceAllButLast(str, pOld, pNew) {
  var parts = str.split(pOld)
  if (parts.length === 1) return str
  return parts.slice(0, -1).join(pNew) + pOld + parts.slice(-1)
}

var test = 'hello there hello there hello there'
test = replaceAllButLast(test, ' there', '')

console.log(test) // hello hello hello there