Please ensure that: Your code is properly formatted as code block - see the sidebar (About on mobile) for instructions You include any and all error messages in full You ask clear questions You demonstrate effort in solving your question/problem - plain posting your assignments is forbidden (and such posts will be removed) as is asking for or giving solutions. Trying to solve problems on your own is a very important skill. Also, see Learn to help yourself in the sidebar If any of the above points is not met, your post can and will be removed without further warning. Code is to be formatted as code block (old reddit: empty line before the code, each code line indented by 4 spaces, new reddit: https://i.imgur.com/EJ7tqek.png ) or linked via an external code hoster, like pastebin.com, github gist, github, bitbucket, gitlab, etc. Please, do not use triple backticks (```) as they will only render properly on new reddit, not on old reddit. Code blocks look like this: public class HelloWorld { public static void main(String[] args) { System.out.println("Hello World!"); } } You do not need to repost unless your post has been removed by a moderator. Just use the edit function of reddit to make sure your post complies with the above. If your post has remained in violation of these rules for a prolonged period of time (at least an hour), a moderator may remove it at their discretion. In this case, they will comment with an explanation on why it has been removed, and you will be required to resubmit the entire post following the proper procedures. To potential helpers Please, do not help if any of the above points are not met, rather report the post. We are trying to improve the quality of posts here. In helping people who can't be bothered to comply with the above points, you are doing the community a disservice. I am a bot, and this action was performed automatically. Please contact the moderators of this subreddit if you have any questions or concerns. More on reddit.com

My assumption is, that Lambdas are a new feature, and JVM optimization are not at the level of native loops yet.

Also you use different method calls in comparison. If you use Double::compare you can not compare it with d < min in performance.

More on reddit.com

you'd expect it to work like any other functional language but... nope, gml gonna gml More on reddit.com

Lambda expressions are, for the most part, a more concise way of writing something that previously would have required a class instance (usually an anonymous class) to implement. So if you understand how and why anonymous classes are used, you can figure out lambda expressions. If you don't, then your first step should be to understand those. Java does not have function pointers. Function pointers are used in C and C++ extensively. They are a way of passing functions to other functions. In Lisp you can do that directly, because functions are so-called "first class objects", but in C you have to pass a pointer to some function X and then the function you are calling can call X via the pointer. But, Java doesn't have these. What you do for Java is pass in an object with an implemented method and whatever you are calling will call the method in that class. This is done something like: someObject.foo(new Bonk() { void bonk(String who) { System.out.println("I'm bonking you, " + who); }); This looks a little confusing, but what we are doing is defining a new class (and not giving it a name) and creating an instance of that class at the same time, and then passing that instance to foo. You could do this as something like: class MyBonk implements Bonk { void bonk(String who) { System.out.println("I'm bonking you, " + who); } } MyBonk bonker = new MyBonk(); someObject.foo(bonker); But the first way is much, much terser, right? I love anonymous classes, but I'm a closet LISP programmer, so that would figure. Anyway, lambda functions are a mostly syntactic shortcut for anonymous classes (although there are JVM changes as well, for reasons that I have not investigated). If you have an anonymous class with just one method then it's pretty obvious that the purpose of that class is to call that method. Anonymous functions remove even more of the cruft and you say: someObject.foo(who -> System.out.println("I'm bonking you, " + who); And every LISP programmer in the world says "Wow, we figured this out over half a century ago". More on reddit.com