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React if文構築の方法

Posted at

即時関数を用いる場合

 { (()=>{
          if(this.state.persons[0].name !=="genki"){
            return <p>Wrong</p>;
          }else{
            return <p>none</p>
          }
        })()
      }

三項演算子を利用する方法


     { 
          this.state.showPersons === true ?
            <div>
              <Person
                name={this.state.persons[0].name} 
                age={this.state.persons[0].age}  />
              <Person
                name={this.state.persons[1].name}
                age={this.state.persons[1].age}
                click={this.switchNameHandler.bind(this, "Max!!")}
                changed={this.nameChangedHandler} >
                My Hobbies: Racing
              </Person>
              <Person
                name={this.state.persons[2].name}
                age={this.state.persons[2].age}/> 
             </div> :null
       }

引用: https://www.yoheim.net/blog.php?q=20180409

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