hasExtension.js

/**
 * Checks to see if a given string ends with a particular file extension
 * @param {string} f String representing a possible file name with extension
 * @param {string} e The sought extension
 * @returns {boolean}
 */
function hasExtension (f, e) {
	if (e[0] !== '.') {
		e = '.' + e;
	}
	if (f.substring(f.length-e.length,f.length) !== e) {
		return false;
	} else {
		return true;
	}
}