Remove last line from string

Question

How do I remove the last line "\n" from a string, if I dont know how big the string will be?

var tempHTML = content.document.body.innerHTML;
var HTMLWithoutLastLine = RemoveLastLine(tempHTML);

function RemoveLastLine(tempHTML)
{
   // code
} 

Answer 1

Try:

if(x.lastIndexOf("\n")>0) {
    return x.substring(0, x.lastIndexOf("\n"));
} else {
    return x;
}