在while与for中,这两个来源通过在不同浏览器中运行各种循环并以毫秒为单位比较结果,很好地记录了速度现象:https://blogs.oracle.com/greimer/entry/best_way_to_code_a和:http://www.stoimen.com/blog/2012/01/24/javascript-performance-for-vs-while/. 从概念上讲,for循环基本上是一个封装的while循环,专门...
While vs. . Repeat Loops in R? 我想知道除了语法之外,"while“循环和R中的"repeat”循环有什么不同。在决定使用哪一个时,是否有特定的情况需要我密切关注?(例如,区别是否类似于使用" for“循环for functions与使用apply循环?)从我对文档的阅读来看,我更喜欢while循环,因为break条件就在"while“命令的旁边,尽...
We use while loops when we don’t know the number of times we want to loop over a code, but we know the condition which determines the execution of the loop body. Whereas for loops are particularly used toiterate over a sequence. When you know the number of times the loop has to be...
While Loops in Python Examples of While Loop in Python Infinite Loop For Loop Vs While Loop Lesson Summary Frequently Asked Questions What is a while loop Python? A while loop has the syntax 'while condition: do_stuff' where 'do_stuff' is usually placed on the next line and indented. ...
In this tutorial, I explain how to use for, while and until loops in bash shell scripts, and demonstrate their use cases using shell script examples.Loop Statements: for vs. while vs. untilBoth the for and while statements allow you to express a loop with a terminating condition (i.e.,...
While vs. . Repeat Loops in R? 我想知道除了语法之外,"while“循环和R中的"repeat”循环有什么不同。在决定使用哪一个时,是否有特定的情况需要我密切关注?(例如,区别是否类似于使用" for“循环for functions与使用apply循环?)从我对文档的阅读来看,我更喜欢while循环,因为break条件就在"while“命令的旁边,尽...
for vs while loops A for loop is usually used when the number of iterations is known. For example, // This loop is iterated 5 times for (int i = 1; i <=5; ++i) { // body of the loop } Here, we know that the for-loop will be executed 5 times. However, while and do.....
forloops exactly as fast aswhileloops Now let’s look at some sample functions and their bytecode (produced by MXMLC 4.1) to get an idea as to why the performance is as it is. Firstly, the AS3 functions: privatefunctionforForward():void{vari:int;for(i =0;i<100;++i){}}privatefunc...
Combining loops with where A For in loop can be combined with the where keyword. To learn more about this, check outWhere usage in Swift. If you like to improve your Swift knowledge, even more, check out theSwift category page. Feel free tocontact meor tweet to me onTwitterif you have...
python性能：while vs for循环破产了。但是，严肃地说，由于以下原因，这些比较都没有多大意义：而您可以...