Useful method from Apache Commons: org.apache.commons.lang.StringUtils.isBlank(String str) https://commons.apache.org/proper/commons-lang/javadocs/api-2.6/org/apache/commons/lang/StringUtils.html#isBlank(java.lang.String)
It’s very easy: not all(t1) returns False only if all values in t1 are non-empty/nonzero and not None. all short-circuits, so it only has to check the elements up to the first empty one, which makes it very fast.
Try this: function isEmpty(map) { for(var key in map) { if (map.hasOwnProperty(key)) { return false; } } return true; } Your solution works, too, but only if there is no library extending the Object prototype. It may or may not be good enough.
Instead of using .Count() == 0, just use .Count == 0. This is using the stack’s property rather than the linq extension method.
Assuming you mean Queue<T> you could just use: if (queue.Count != 0) But why bother? Just iterate over it anyway, and if it’s empty you’ll never get into the body: Queue<string> queue = new Queue<string>(); // It’s fine to use foreach… foreach (string x in queue) { // We just won’t get in here… }
How you test depends on the Property’s DataType: | Type | Test | Test2 | Numeric (Long, Integer, Double etc.) | If obj.Property = 0 Then | | Boolen (True/False) | If Not obj.Property Then | If obj.Property = False Then | Object | If obj.Property Is Nothing Then | | String | If obj.Property …
An object of a class cannot be set to NULL; however, you can set a pointer (which contains a memory address of an object) to NULL. Example of what you can’t do which you are asking: Cat c; c = NULL;//Compiling error Example of what you can do: Cat c; //Set p to hold the …
dart:developer library includes inspect function that allows debuggers to open an inspector on the object. To use it add: import ‘dart:developer’; And then you can see your inspected variable/object in console with: inspect(myVar);
You should use null. In most cases it doesn’t matter, but it is a good habit to get into anyway, because occasionally you may want to check if a list of non-comparable things is empty. Here is a short, crisp example showing this difference: > null [id] False > [id] == [] <interactive>:1:1: error: • …
I solved a similar problem using NULLIF function: UPDATE table SET col1 = NULLIF(col1, ”) From the T-SQL reference: NULLIF returns the first expression if the two expressions are not equal. If the expressions are equal, NULLIF returns a null value of the type of the first expression.