Set and Get Cookies

set-get-cookies.js

/**
 * Set a cookie
 *
 * @param {string} name   - The name of the cookie.
 * @param {string} value  - The value of the cookie.
 * @param {number} [days] - The number of days until the cookie expires.
 */
const setCookie = ( name, value, days ) => {
	let expires = '';
	if ( days ) {
		const date = new Date();
		date.setTime( date.getTime() + days * 24 * 60 * 60 * 1000 );
		expires = '; expires=' + date.toUTCString();
	}
	document.cookie = name + '=' + ( value || '' ) + expires + '; path=/';
};

/**
 * Returns the value of a cookie with the specified name.
 *
 * @param {string} name - The name of the cookie.
 * @return {string} The value of the cookie, or an empty string if the cookie does not exist.
 */
const getCookie = ( name ) => {
	const nameEq = name + '=';
	const ca = document.cookie.split( ';' );
	for ( let i = 0; i < ca.length; i++ ) {
		let c = ca[ i ];
		while ( c.charAt( 0 ) === ' ' ) c = c.substring( 1, c.length );
		if ( c.indexOf( nameEq ) === 0 )
			return c.substring( nameEq.length, c.length );
	}
	return '';
};