Javascript kebab case helpers

kebab-case.js

/*
  https://run.plnkr.co/plunks/Sv54t4/
*/
function anyToKebab(s) {
  if('string' !== typeof s) return s;
  var result = '', i = 0, len = s.length;
  for(; i < len; i++) 
    if(s[i] === s[i].toUpperCase()) 
      result += '-' + s[i].toLowerCase();   
    else
      result += s[i].toLowerCase();      
  return result[0] !== '-' ? result : result.substr(1);
}

function kebabToPascal(s) {
  if('string' !== typeof s || s.length === 0) return s;
  var result = s.substr(0,1).toUpperCase(), i = 1, len = s.length; 
  for(; i < len; i++) 
    if(s[i] === '-' && i+1 !== len) {
        result += s[i+1].toUpperCase();   
      i++;      
    }
    else
      result += s[i].toLowerCase();      
  return result[0] !== '-' ? result : result.substr(1);
}
 
function kebabToCamel(s) {
  if('string' !== typeof s) return s;
  var p = kebabToPascal(s);
  return p.substr(0,1).toLowerCase() + p.substring(1); 
}

console.log('testing empty string to kebab')
var input = '', output = anyToKebab(input);
if(input === output) 
  console.log('nothing happend...');
else
  console.log(input, ' -> ', output);

console.log('testing invalid type to kebab')
input = 1000, output = anyToKebab(1000); 
if(input === output) 
  console.log('nothing happend...');
else
  console.log(input, ' -> ', output);

console.log('testing camel to kebab')
input = 'someCamelCaseString', output = anyToKebab(input); 
if(input === output) 
  console.log('nothing happend...');
else
  console.log(input, ' -> ', output);

console.log('testing pascal to kebab')
input = 'SomePascalCaseString', output = anyToKebab(input); 
if(input === output) 
  console.log('nothing happend...');
else
  console.log(input, ' -> ', output);

console.log('testing kebab to pascal')
input = 'some-kebab-case-string', output = kebabToPascal(input); 
if(input === output) 
  console.log('nothing happend...');
else
  console.log(input, ' -> ', output);

console.log('testing kebab to camel')
output = kebabToCamel(input); 
if(input === output) 
  console.log('nothing happend...');
else
  console.log(input, ' -> ', output);