Andmapco - dev team

// listingId = '', 0, null, undefined, false //let listingId if ( typeof listingId === 'undefined' ) console . log ( 'listingId is undefined' ) else console . log ( listingId ) if (!! listingId ) console . log ( listingId ) else console . log ( 'listingId does not found' ) if ( listingId ) console . log ( listingId ) else console . log ( 'listingId does not found' ) if ( listingId === undefined ) console . log ( 'listingId does not found' ) else console . log ( listingId )