Try ISNULL(FirstName, ‘<BlankValue>’) — In SQL Server IFNULL(Firstname, ‘<BlankValue>’) — In MySQL So, CONCAT(ISNULL(FirstName,”),ISNULL(LastName,”),ISNULL(Email,”)) — In SQL Server CONCAT(IFNULL(FirstName,”),IFNULL(LastName,”),IFNULL(Email,”)) — In MySQL would return the same thing without the null issue (and a blank string where nulls should be).
Concatenation is just appending all of the static files into one large file. Minification is just removing unnecesary whitespace and redundant / optional tokens like curlys and semicolons, and can be reversed by using a linter. Uglification is the act of transforming the code into an “unreadable” form, that is, renaming variables/functions to hide the … Read more
For strings you can just write “abc” * 3, which works via StringOps and uses a StringBuffer behind the scenes. For characters I think your solution is pretty reasonable, although char.toString * n is arguably clearer. Do you have any reason to suspect the List.fill version isn’t efficient enough for your needs? You could write … Read more
The question is already answered, however when I first saw it I thought of NodeJS Buffer. But it is way slower than the +, so it is likely that nothing can be faster than + in string concetanation. Tested with the following code: function a(){ var s = “hello”; var p = “world”; s = … Read more
Never call DataFrame.append or pd.concat inside a for-loop. It leads to quadratic copying. pd.concat returns a new DataFrame. Space has to be allocated for the new DataFrame, and data from the old DataFrames have to be copied into the new DataFrame. Consider the amount of copying required by this line inside the for-loop (assuming each … Read more
Actually you don’t need to split all words. You can split your text by last space symbol into two parts using rsplit. Example: >>> text=”Python: Cut off the last word of a sentence?” >>> text.rsplit(‘ ‘, 1)[0] ‘Python: Cut off the last word of a’ rsplit is a shorthand for “reverse split”, and unlike regular … Read more
In Go rune type is not a character type, it is just another name for int32. If you come from Java or a similar language this will surprise you because Java has char type and you can add char to a string. String s = “hello”; char c=”x”; System.out.println(s + c); In Go you need … Read more
You can use .addAll() to add the elements of the second list to the first: array1.addAll(array2); Edit: Based on your clarification above (“i want a single String in the new Arraylist which has both name and number.“), you would want to loop through the first list and append the item from the second list to … Read more
With ES6, you can use Template strings: var username=”craig”; console.log(`hello ${username}`); ES5 and below: use the + operator var username=”craig”; var joined = ‘hello ‘ + username; String’s concat(..) var username=”craig”; var joined = ‘hello ‘.concat(username); Alternatively, use Array methods: join(..): var username=”craig”; var joined = [‘hello’, username].join(‘ ‘); Or even fancier, reduce(..) combined with … Read more
You can use a repeated node, like this: user_dir: &user_home /home/user user_pics: *user_home I don’t think you can concatenate though, so this wouldn’t work: user_dir: &user_home /home/user user_pics: *user_home/pics