Two functions for trim() in javascript

Trim is one of the most common operations in any programming language. That's while it is implemented in almost all of them. I was amazaed that javascript doesn't provide this. Here are two functions for that purpose.

1. Using cycles

function trim(str)
{
   if (str=="")
      return "";
   while (str.indexOf(" ")==0)
   {
      str = str.substring(1,str.length);
      if (str=="")
         return "";
   }
   while (str.lastIndexOf(" ")==(str.length-1))
   {
      str = str.substring(0,str.length-1);
      if (str=="")
         return "";
    }    return str; }

2. Using RegEx

function trim(str)
{
    return str.replace(/^\s*|\s*$/g,"");
}
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This page was last modified on 2025-03-18 04:44:25