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Cómo agregar un nombre de clase para publicaciones pares en nextjs

Estoy trabajando con nextjs y estoy tratando de obtener una lista de imágenes, quiero agregar una clase (usando la condición if else) Quiero incluso publicar quiero agregar className "mt10"

Aquí está mi código

 {this.state.books.map((book, index) => { const isEven = index % 2 === 0 console.log('data is '+ isEven); return ( <div className="col-md-4 {isEven } forbcol"> <div className="bookimg"> <img src="img/forbes.png" /> </div> </div> ) })}
about 4 years ago · Juan Pablo Isaza
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{this.state.books.map((book, index) => { return ( <div className={`col-md-4 ${index % 2 === 0 ? 'mt10' : '' } forbcol`}> <div className="bookimg"> <img src="img/forbes.png" /> </div> </div> ) })}
about 4 years ago · Juan Pablo Isaza Report

0

{this.state.books.map((book, index) => { const isEven = index % 2 === 0 console.log('data is '+ isEven); const style = {`col-md-4 ${isEven } forbcol`} return ( <div className={style}> <div className="bookimg"> <img src="img/forbes.png" /> </div> </div> ) })}
about 4 years ago · Juan Pablo Isaza Report
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