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ラジアンから角度を求める関数をMathオブジェクトに定義する

Posted at

degrees関数が標準で入ってないのはなんでなのでしょうか・・・。

    Math.degrees = function(radian){
        if(isNaN(radian)){
           return NaN;
        }
        return radian * 360/(2*Math.PI);
    }
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