CamelCaseUtil.normalizeCamelCase in JS

camelcase.js

function isUpperCase(c) {
  return (c !== c.toLowerCase());
}

function normalize(s) {
  var buffer = '';
  var upperCase = false;
  var l = s.length;

  var c, nextUpperCase;
  for (var i = 0; i < s.length; ++i) {
    c = s.charAt(i);

    if (i < (l - 1)) {
      nextUpperCase = isUpperCase(s.charAt(i + 1));
    }

    if ((i > 0) && isUpperCase(c)) {
      if (upperCase && nextUpperCase) {
        c = c.toLowerCase();
      }

      upperCase = true;
    }
    else {
      upperCase = false;
    }

    buffer += c;
  }

  return buffer;
}

console.dir([
  'inputOVPs',
  'inputOVPS',
  'somethingURL',
  'somethingURLs'
].reduce(function (memo, s) {
  memo[ s ] = normalize(s);
  return memo;
}, {}));

/*

outputs

{ inputOVPs: 'inputOvPs',
  inputOVPS: 'inputOvps',
  somethingURL: 'somethingUrl',
  somethingURLs: 'somethingUrLs' }
  
*/>