string-comparison

I am making a server call in some Objective-c code. If it returns as a @"yes" , it will do an action. For some reason, the // DO ACTION HERE part is never reached. NSData *returnData = [NSURLConnection sendSynchronousRequest:request returningResponse:nil error:nil]; NSString *returnString = [[NSString alloc] initWithData:returnData encoding:NSUTF8StringEncoding]; NSString *returnStringResults = returnString; NSString *yesText = @"yes"; if (returnStringResults == yesText) { testLabel.text = @"Success"; // DO ACTION HERE } W Dyson if ([returnStringResults isEqualToString:yesText]) { testLabel

How do you compare the text in two text fields to see if they are the same, such as in "Password" and "Confirm Password" text fields? if (passwordField == passwordConfirmField) { //they are equal to each other } else { //they are not equal to each other } In Objective-C you should use isEqualToString: , like so: if ([passwordField.text isEqualToString:passwordConfirmField.text]) { //they are equal to each other } else { //they are *not* equal to each other } NSString is a pointer type. When you use == you are actually comparing two memory addresses, not two values. The text properties of your

All of these txtUsername.Text <> vbNullString txtUsername.Text <> String.Empty txtUsername.Text <> "" seem to return the same result. So, what's the difference between vbNullString , String.Empty and "" ? vbNullString is a constant, more likely out of VB6, String.Empty and "" are the same, some say that there is a performance difference, but that is not true, it is your choice what you use. To check whether a string is empty you can use If String.IsNullOrEmpty(String) . The advantage is that it will also check for null , because string is a class and because of this a reference type. What's

I'm actually trying to answer this question but as that's very involved and unlikely to get a good response quickly, I'm going to try and work out the implementation myself. The fundamental problem seems to be that the C# example I was following doesn't translate directly to VB. When examining a String comparison BinaryExpression in a lambda, VB reports the Expression.Method.DeclaringType to be Microsoft.VisualBasic.CompilerServices.Operators with a method name of CompareString . This is clearly VB-specific. The Expression is just comparing x.Content_Type <> "" and calling ToString on it

I'm sure this is a simple solution, just haven't found exactly what I needed. Using php, i have a variable $source. I wanna check if $source starts with 'http'. if ($source starts with 'http') { $source = "<a href='$source'>$source</a>"; } Thanks! if (strpos($source, 'http') === 0) { $source = "<a href=\"$source\">$source</a>"; } Note I use === , not == because strpos returns boolean false if the string does not contain the match. Zero is falsey in PHP, so a strict equality check is necessary to remove ambiguity. Reference: http://php.net/strpos http://php.net/operators.comparison You want the

Background Users can type in a name and the system should match the text, even if the either the user input or the database field contains accented (UTF-8) characters. This is using the pg_trgm module. Problem The code resembles the following: SELECT t.label FROM the_table t WHERE label % 'fil' ORDER BY similarity( t.label, 'fil' ) DESC When the user types fil , the query matches filbert but not filé powder . (Because of the accented character?) Failed Solution #1 I tried to implement an unaccent function and rewrite the query as: SELECT t.label FROM the_table t WHERE unaccent( label ) %

If I execute the following statement: string.Compare("mun", "mün", true, CultureInfo.InvariantCulture) The result is '-1', indicating that 'mun' has a lower numeric value than 'mün'. However, if I execute this statement: string.Compare("Muntelier, Schweiz", "München, Deutschland", true, CultureInfo.InvariantCulture) I get '1', indicating that 'Muntelier, Schewiz' should go last. Is this a bug in the comparison? Or, more likely, is there a rule I should be taking into account when sorting strings containing accented The reason this is an issue is, I'm sorting a list and then doing a manual