Node.js quick CLI arguments parser for key-value pair arguments

quick-argument-parser.js

/**
 * Takes arguments in the form of --arg-name value and puts them into an object (argMap).
 * Argument keys begin with double hyphens and additional hyphens are converted to camelCase.
 * 
 * E.g. `node quick-argument-parser.js --test-arg1 'value1' --test-arg2 'value2'` will create argMap with the value:
 * ```
 * {
 * 	testArg1: 'value1',
 * 	testArg2: 'value2'
 * }
 * ```
 * Node.js >= 4
 */

const args = process.argv.slice(2);
const argMap = {};

if (args.length % 2)
	throw new Error('Invalid number of arguments');

for (let i = 0; i < args.length; i += 2) {
	let key = args[i];
	
	if (!/^--([a-z]+-)*[a-z]+$/g.test(key))
		throw new Error('Invalid argument name');
	
	key = key
		.replace(/^--/, '')
		.replace(/-([a-z])/g, g => g[1].toUpperCase());
	
	argMap[key] = args[i + 1];
}

// use argMap here