Tutorial by Examples: ch

Sub Main() Dim People = New List(Of String)({"Bob Barker", "Ricky Bobby", "Jeff Bridges"}) Console.WriteLine(People.Contains("Rick James")) Console.WriteLine(People.Contains("Ricky Bobby")) Console.WriteLine(Pe...

There is an example for extract a folder from an archive in the current location : tar -xf archive-name.tar If you want to extract a folder from an archive to a specfic destination : tar -xf archive-name.tar -C ./directory/destination

There is an example of listing content : tar -tvf archive.tar The option -t is used for the listing. For listing the content of a tar.gz archive, you have to use the -z option anymore : tar -tzvf archive.tar.gz

def lst = [10, 20, 30, 40] lst.find { it > 25 } // 30. Note: it returns a single value

When factors are created with defaults, levels are formed by as.character applied to the inputs and are ordered alphabetically. charvar <- rep(c("W", "n", "c"), times=c(17,20,14)) f <- factor(charvar) levels(f) # [1] "c" "n" "W" ...

It's possible to call functions from the pygame.key and pygame.mouse module to receive the state of the key and mouse. However, it's not the recommended way to process events in pygame since there are some flaws with it: You'll receive the states when the function is called, which means you mig...

The FIND statement can work with regular expressions directly: DATA(lv_test) = 'The quick brown fox'. FIND REGEX '..ck' IN lv_test. " sy-subrc == 0 FIND REGEX 'a[sdf]g' IN lv_test. " sy-subrc == 4

The n & (n - 1) trick (see Remove rightmost set bit) is also useful to determine if an integer is a power of 2: bool power_of_2 = n && !(n & (n - 1)); Note that without the first part of the check (n &&), 0 is incorrectly considered a power of 2.

Before you start the cherry-pick process, you can check if the commit you want to cherry-pick already exists in the target branch, in which case you don't have to do anything. git branch --contains <commit> lists local branches that contain the specified commit. git branch -r --contains <...

Another PCRE-compliant modifier expressed with /A modifier. If this modifier is set, the pattern is forced to be "anchored", that is, it is constrained to match only at the start of the string which is being searched (the "subject string"). This effect can also be achieved by ap...

One more PCRE modifier that allows the use of duplicate named groups. NOTE: only inline version is supported - (?J), and must be placed at the start of the pattern. If you use /(?J)\w+-(?:new-(?<val>\w+)|\d+-empty-(?<val>[^-]+)-collection)/ the "val" group values will be ...

Searching git log using some string in log: git log [options] --grep "search_string" Example: git log --all --grep "removed file" Will search for removed file string in all logs in all branches. Starting from git 2.4+, the search can be inverted using the --invert-grep...

Information about the database connections SELECT a.mon$attachment_id as Attachment_ID, a.mon$server_pid as Server_PID, case a.mon$state when 1 then 'active' when 0 then 'idle' end as State, a.mon$attachment_name as Database_Name, ...

For those that are using UI to branch click Right Mouse on repository then Tortoise Git -> Create Branch... New window will open -> Give branch a name -> Tick the box Switch to new branch (Chances are you want to start working with it after branching). -> Click OK and you should be do...

TL; DR: CoffeeScript switch statements use when for each case and else for the default case. They use then for one-line cases and commas for multiple cases with a single outcome. They intentionally disallow fallthrough and so don't need an explicit break (since it's always there implicitly). A switc...

Less allows the usage of the parent selector (&) anywhere in a complex selector and thus allows changing styles when the current element is within another element which gives it a different context: For example, in the below code the parent selector is placed at the end and thus it actually be...

- (void)testDoSomethingThatTakesSomeTime{ XCTestExpectation *completionExpectation = [self expectationWithDescription:@"Long method"]; [self.someObject doSomethingThatTakesSomeTimesWithCompletionBlock:^(NSString *result) { XCTAssertEqualObjects(@"result", result, @"Re...

These are URL schemes supported by native apps on iOS, OS X, and watchOS 2 and later. Opening link in Safari: Objective-C NSString *stringURL = @"http://stackoverflow.com/"; NSURL *url = [NSURL URLWithString:stringURL]; [[UIApplication sharedApplication] openURL:url]; Swift: let s...

To open an app with defined URL scheme todolist://: Objective-C NSURL *myURL = [NSURL URLWithString:@"todolist://there/is/something/to/do"]; [[UIApplication sharedApplication] openURL:myURL]; Swift let stringURL = "todolist://there/is/something/to/do" if let url = NSURL(s...

ConnectivityManager cm = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE); NetworkInfo Info = cm.getActiveNetworkInfo(); if (Info == null || !Info.isConnectedOrConnecting()) { Log.i(TAG, "No connection"); } else { ...