Comparing if statement with ?: operator on addition

If the value selected by the conditional operator ?: is to be added with the addition assignment operator +=, its operation will come to be slow.  Using the assignment operator = instead makes it a little faster.  But in this case, the if statement is better to use.

JActionScripters "When to use the ?: conditional operator"
http://blog.jactionscripters.com/2011/02/09/when-to-use-the-conditional-operator/

比較している処理の内容については、F-site「条件演算子?:はいつ使うとよいか」をご参照ください。
http://f-site.org/articles/2011/02/09113238.html