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JavaScriptでメソッドのnullチェック

Last updated at Posted at 2018-02-21

外部ライブラリを使うときとか、メソッドがあるかないかわからない時にかます

    //NG
    if(fuga){
        //ReferenceError: fuga is not defined
    }

    //OK
    if(typeof fuga !== 'undefined'){
        //メソッドがあればtrue       
    }

Twitterで教えてくれた人ありがとうございます

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