camel_case.js

function toCamelCase(str) {
    //get the words from the string, would use \w but it includes underscores.
    var words = str.match(/([a-zA-Z0-9]+)/g);

    words = words.map(function(word, i){

        //ignore the first word otherwise its first letter will be capitalised.
        if(i == 0) return word;

        //capitalise first letter in each word and concatenate it onto the rest of itself. E.g. C + ode
        return word.charAt(0).toUpperCase() + word.substr(1);
    });

    //join the words back together, the end.
    return words.join('');
}

//Tests: camel_case_spec.js
var expect = chai.expect;

describe('toCamelCase', function() {
    it('Should convert first letter of each word except the first, to upper case', function() {
        expect(toCamelCase('do something')).to.equal('doSomething');
        expect(toCamelCase('do something else')).to.equal('doSomethingElse');
        expect(toCamelCase('underscore_me')).to.equal('underscoreMe');
        expect(toCamelCase('cat-jumps-up')).to.equal('catJumpsUp');
        expect(toCamelCase('1 ones and zeros 0')).to.equal('1OnesAndZeros0');
        expect(toCamelCase('one+two=three')).toEqual('oneTwoThree');
        expect(toCamelCase('non alpha nums?/!')).to.equal('nonAlphaNums');
        expect(toCamelCase('Caps-Lock')).to.equal('CapsLock');
    });
});