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There may not be an easier way to write this, but I want to be new to Swift, maybe I’m missing something. Actually I have a (fileName) parameter for the methodology, which is an optional string?
. I need to check if nil
or 1 line is empty. This is the scope code I have, it works and works fine, but it certainly looks like it could be a little bigger Not concise / readable.
func writeFile (fileName: String?, withContents content: String, errorCallback failedCallback: RCTResponseSenderBlock, callback successCallback: RCTResponseSenderBlock) -> Empty // If filename having a value is definitely not zero if fileName is equal to fileName // Check if the string is empty by number of events (fileName) <1 // Create a delivery message Allow resultsDict = [ "Success": a lie, "errMsg": "File name is blank without question" ] // Run the JavaScript error callback handler callback failed ([resultsDict]) Get well; // Stop execution of all these functions // otherwise filename is 0 and should return the actual error message. another // Create a failure message just leave resultDict = [ "Success": a lie, "errMsg": "The file name was still blank" ] // Run JavaScript callback handler on failure callback failed ([resultsDict]) Get well; // Stop the execution of this function
requested May 29, 15 @ 8:09 pm
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First create an optional line 0 to customize the example var fileName: string?
Now the code to follow if the file name is empty / empty on a specific single line:
if (filename ?? "") .isEmpty println ("empty")another println ("not empty")
a ?? B.
If the type of a is nonzero, a new one is returned. If a is zero, t is returned instead.
if (filename ?? ""). Rate empty
First filename to make sure it is blank. If so, replace it with a clean rope.
answered May 29, 2015 at 20:20
119k
You have the most coveted approach. All you have to do is put your IF statements on one line:
func writeFile (fileName: String?, withContents information: String, errorCallback failedCallback: RCTResponseSenderBlock, callback successCallback: RCTResponseSenderBlock) -> Empty
This code first checks to see if fileName
is nil
. If so, then it ends up in an error block. Otherwise, the program goes to the second condition. In the second condition, the block enters an error state if or if fileName
has a value and is optional. Only if fileName
takes precedence and is NOT empty, the block error will be ignored.
answered May 29 '15 at 20:15
Approved
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3,472
You can combine your if let
with the if
statement into something:
if let str = fileName when! str.isEmpty println (string) Next to you println ("empty")
This option is useful if you need help using a filename after checking if it is nil
or empty.
answered May 29, 2015 at 20:28
22.1k
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A string in Go is a value. Hence, the collection cannot be null.
To explicitly check if a given string is empty or not, we can use any built-in len () function in Go. Or maybe we can even use str == "" to check if a number is empty.
3 reviews. If you cannot implement "", return a pointer of the form * string; or - since this is Go - you can declare multiple return values, among which: (response string, ok bool). Using the string *: does not return any suggestions unless you need to return a specific "useful" string.