JavaScript - String Handling

string.js

var string = {
  // pad string with 0 from the left
  padLeft: function (nr, n, str) { // pad string with 0 from the left
    if (typeof nr === 'undefined' || nr === '') {
      return '';
    }
    return Array(n - String(nr).length + 1).join(str || '0') + nr;
  },

  // camelcase
  camelcase: function (str) {
    return str.slice(0, 1).toUpperCase() + str.slice(1, str.length);
  }
};