Top "Exists" questions

How to test property existence and type based on NSString typed key?

In my quest to update a Core Data model within my iOS project, I'm querying a server for JSON objects …

properties css-selectors exists key-value-coding objective-c-2.0

check if variable exists in the workspace with cellfun

Consider the following example: dat1 = 1; dat2 = 2; Variables = {'dat1','dat2'}; a = cellfun(@(x)exist(x,'var'),Variables); for i = 1:…

matlab exists

GNU-make check if element exists in list/array

I have a list defined in the make file and the user is supposed to set an environment variable which …

arrays list element gnu-make exists

Check if a template exists within a Django template

Is there an out-of-the-box way of checking if a template exists before including it in a Django template? Alternatives are …

django templates try-catch exists