They are not one and the same. Let me explain the difference. forEach: This iterates over a list and applies some operation with side effects to each list member (example: saving every list item to the database) and does not return anything. map: This iterates over a list, transforms each member of that list, and … Read more
Off the top of my head, no. I think the best you could do is something like this: def loop(f,n): for i in xrange(n): f() loop(lambda: <insert expression here>, 5) But I think you can just live with the extra i variable. Here is the option to use the _ variable, which in reality, is … Read more
This is the only difference: each: irb> [1,2,3].each { |x| } => [1, 2, 3] irb> x NameError: undefined local variable or method `x’ for main:Object from (irb):2 from :0 for: irb> for x in [1,2,3]; end => [1, 2, 3] irb> x => 3 With the for loop, the iterator variable still lives after … Read more
Yes, function’s always end when ever there control flow meets a return statement. The following example demonstrates how return statements end a function’s execution. function returnMe() { for (var i = 0; i < 2; i++) { if (i === 1) return i; } } console.log(returnMe()); ** Notes: See this other answer about the special … Read more
It’s not that i– is faster than i++. Actually, they’re both equally fast. What takes time in ascending loops is evaluating, for each i, the size of your array. In this loop: for(var i = array.length; i–;) You evaluate .length only once, when you declare i, whereas for this loop for(var i = 1; i … Read more
To exit Pry unconditionally, type exit-program Edit from @Nick’s comment: Also works: !!!
This will print 1 to 5. The return@forEach acts like the keyword continue in Java, which means in this case, it still executes every loop but skips to the next iteration if the value is greater than 5. fun main(args: Array<String>) { val nums = listOf(1, 2, 3, 4, 5, 6, 7, 8, 9, 10) … Read more
Read a file line by line and execute commands: 4+ answers This is because there is not only 1 answer… Shell command line expansion xargs dedicated tool while read with some remarks while read -u using dedicated fd, for interactive processing (sample) running shell with inline generated script Regarding the OP request: running chmod on … Read more
The easiest way to for-each every char in a String is to use toCharArray(): for (char ch: “xyz”.toCharArray()) { } This gives you the conciseness of for-each construct, but unfortunately String (which is immutable) must perform a defensive copy to generate the char[] (which is mutable), so there is some cost penalty. From the documentation: … Read more
Well, you’ll need to loop over them one way or the other. I prefer defining a method like this: public IEnumerable<DateTime> EachDay(DateTime from, DateTime thru) { for(var day = from.Date; day.Date <= thru.Date; day = day.AddDays(1)) yield return day; } Then you can use it like this: foreach (DateTime day in EachDay(StartDate, EndDate)) // print … Read more