handleHash.js

const defaultPrependHash = '#/';
const separator = '/';
const hashValRegexp = /(.*)\?/;

function escapeRegExp(str) {
	return String(str || '').replace(/\W/g, '\\$&');
}

function trimHash(hash, prependHash) {
	if (!hash) {
		return '';
	}
	const regexp = new RegExp('^' + escapeRegExp(prependHash || defaultPrependHash), 'g');
	return hash.replace(regexp, '');
}

const trimParams = hash => {
	const result = hashValRegexp.exec(hash);
	return (result && result[1]) || hash;
};

/**
 * If hash has a certain element
 *
 * @param {string} hash
 * @param {string} search
 * @return {boolean}
 */
export const hasInHash = (hash, search) => {
	return hash !== '' && hash.indexOf(search) > -1;
};

/**
 * Get hash value without '#', prependHash and parameters
 *
 * @param {string} hash
 * @param {string} prependHash
 * @return {string}
 */
export const getHash = (hash, prependHash) => {
	return decodeURIComponent(trimParams(trimHash(hash, prependHash)));
};

/**
 * Get hash value split into an Array.
 *
 * @param {string} hash
 * @param {string} prependHash
 * @return {Array.<string>}
 */
export const getHashAsArray = (hash, prependHash) => {
	return getHash(hash, prependHash).split(separator);
};

/**
 * Get a parameter by name in hash
 *
 * @param {string} hash
 * @param {string} name
 * @return {string}
 */
export const getParameterByName = (hash, name) => {
	name = name.replace(/[[\]]/g, '\\$&');
	const regex = new RegExp('[?&]' + name + '(=([^&#]*)|&|#|$)');
	const results = regex.exec(hash);
	if (!results) {
		return null;
	}
	if (!results[2]) {
		return '';
	}
	return decodeURIComponent(results[2].replace(/\+/g, ' '));
};