String.prototype.expandTabs()

I personally love both JavaScript and Python. For this reason, from time to time I like to port functions that are available in Python, over to JavaScript. The following is a port of the expandTabs function.

String.prototype.expandTabs = function(tabSize) {
  tabSize = Math.min(Math.max(parseInt(+tabSize || 8), 1), 32);
  return this.replace(/^.*\t.*$/gm, function(line) {
    var allBefore = "";
    return line.replace(/(.*?)(\t+)/g, function(match, before, tabs) {
      allBefore += before;
      tabs = new Array(1 + tabSize * tabs.length - allBefore.length % tabSize).join(" ");
      allBefore += tabs;
      return before + tabs;
    });
  });
};

The biggest difference between this JavaScript version and the Python version is the limitation of a 32 character tab size. If you want to increase the maximum tab size, simply change 32 to something else.

String.protototype.toCharCodes()

One of the functions that didn’t make the cut for jPaq is String.prototype.toCharCodes().  The reason is I don’t feel that it is a function that many people are looking for.  Still, if you are looking for a good implementation for it, you can use this:

String.prototype.toCharCodes = function() {
  for(var arr = this.split(""), i = this.length - 1; i >= 0; i--)
    arr[i] = arr[i].charCodeAt(0);
  return arr;
};