CODEWITHSUNDEEP
javascriptreactjsjsx
user2965653
user2965653

Reputation: 17

JavaScript how to get a length from a map array

I am new to JSX and I am trying to get the number of Employees for each team this.state.teams[0].employee.length will give me the number of employee for the [0] object in the array, how can I get the number of employees for each Team and only render it once?

render() {
    const {teams, isLoading} = this.state;
    const { location } = this.props;

    if (isLoading) {
        return <p>Loading...</p>;
    }
    // console.log("Number of Employees team", this.state.teams[0].employee.length);
    

    const teamList = teams.map(team => {

        console.log("TEAM Employees", teams[0].employee.length);

        return <tr key={team.id}>
               <td>
                <div className="tableContent">
                    <div>
                         {team.name} 
                    </div>
                    <div>
                      <ul>{team.employee.map(employee => {
                       return <li key={employee.id}>{employee.name}: {employee.email}</li>
                      })}</ul>
                    </div>
                    <div>
                     {team.employee.map(employee => {
                       return <li key={employee.id}>{teams[0].employee.length}</li>
                      })}
                    </div>
                </div>                    
            </td>
        </tr>
    });

Upvotes: 1

Views: 715

Answers (2)

Ram Segev
Ram Segev

Reputation: 2573

You can use Object.keys(teams[0].employee).length

The Object.keys() method returns an array of a given object's own enumerable property names, iterated in the same order that a normal loop would. MDN

Upvotes: 0

RadekDeveloper
RadekDeveloper

Reputation: 98

You can try this for a specific team:

const teamList = teams.map(team => {
   console.log("TEAM Employees", team.employee.length);
}

or this for number of employees in all teams:

const numberOfAllEmployees = teams.map(team => team.employee.length).reduce((a,b) => a + b);

Upvotes: 2

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