toPascalCase.js

/*
 * Test Case Source : 
 * https://github.com/rgehan/hacktoberfest-2k18-katas/blob/master/src/toPascalCase.test.js
 */

let re = /([ |_|-])+[\w]/g;

let strings = ["I am pascalCase",
			   "i am pascalCase",
			   "front-end-developer",
			   "Front-end-developer",
			   "lets_go_to_the_gym",
			   "Lets_go_to_the_gym",
			   "areWeThereYet"];

strings = strings.map((s) =>
{
	s = s.replace(/^\w/, s[0].toUpperCase());
	let matches = s.match(re);
	if (matches !== null)
	{
		matches = matches.map((m) =>
		{
			s = s.replace(m, m.replace(/[ -_]/, '').toUpperCase());
		});
	}

	return s;
});

console.log(strings);