camelise(str) JS function

camelise.js

// The function camelise(str) changes dash-separated words 
// like “my-short-string” into camel-cased “myShortString”.
// Removes all dashes, each word after dash becomes uppercased.

function camelize(str) {
  return str.split('-').reduce((a, b) => {
    return a + b[0].toUpperCase()+b.slice(1);
  });  
}

// test
console.log(camelize('')); // returns '';
console.log(camelize('background-color')); // returns 'backgroundColor';
console.log(camelize('list-style-image')); // returns 'listStyleImage';
console.log(camelize('-webkit-transition')); // returns 'WebkitTransition';