check if a column exists in a SQL Server table

in react array.map((a)=>{return a;}) giving error for using {} while declaring function inside array.map()

Anderson

        <div className="matchesdisplay">
            <div > {matchedProfiles?.map((users,_index) => {
                <div key={_index} className="match-card"}>
                    <div className="img-container">
                        <img src={users?.url} alt={users?.first_name}/>
                    </div>
                    <h3>{users.first_name}</h3>
                </div>
                })}
            </div>
        </div>

curly braces are giving error while declaring a function inside array.map

         <div className="matchesdisplay">
            <div > {matchedProfiles?.map((users,_index) => (
                <div key={_index} className="match-card">
                    <div className="img-container">
                        <img src={users?.url} alt={users?.first_name}/>
                    </div>
                    <h3>{users.first_name}</h3>
                </div>
                ))}
            </div>
        </div>

while () paranthesies are working fine . why is this happening that {} curly braces giving an error in react