How to check if a dict has a specific key?

Question

In Vimscript, how can one check whether the dictionary my_dict has the key abc? Something like this:

echo 'abc' in my_dict
" The above naive approach gives "E121: Undefined variable: in"

Answer 1

Use the has_key function:

has_key(my_dict, 'abc')

This will return 1 if the key is found, and 0 if the key is not found.