ads

function wait( sleep ) {
    return new Promise( ( resolve , reject ) => {
        setTimeout( () => {
            resolve();
        } , sleep );
    } );
}

    async index( req , res ) {

        await wait( 1000 );
        console.log( 'a' );

        await wait( 2000 );
        console.log( 'b' );

        await wait( 3000 );
        console.log( 'c' );

        await wait( 4000 );
        console.log( 'd' );

        res.send( 'Hello world!' );

    }