https://log.rowanto.com/categories/foreach/Recent content in Foreach on Rowanto LuoHugo -- gohugo.ioenWed, 06 May 2015 17:06:16 +0000https://log.rowanto.com/posts/the-difference-between-classic-foreach-and-java-8-functional-foreach-loop/Wed, 06 May 2015 17:06:16 +0000https://log.rowanto.com/posts/the-difference-between-classic-foreach-and-java-8-functional-foreach-loop/ <p>People who have played enough with the brand new Java 8 will be familiar with the new <a href="https://docs.oracle.com/javase/tutorial/collections/streams/">forEach(fn(x))</a> loop in lambda. This syntax is quite popular among developers because it&rsquo;s easier and prettier to use than the normal <a href="https://docs.oracle.com/javase/1.5.0/docs/guide/language/foreach.html">For-Each</a> loop. It is also popular in other languages, especially JavaScript.</p> <p>The problem is, I&rsquo;ve seen a very specific bug, which is related to this &ldquo;functional&rdquo; forEach() loop, quite a few times, again and again. People tend to think that these two kinds of loop are 100% identical, which is not. Although Java 8&rsquo;s type-safety make it harder for people to make this mistake because of its compilation error, it&rsquo;s still not 100% safe.</p>