Which is the best way to check for the existence of an attribute?
74576
How to know if an object has an attribute in Python
3358
What's the best way to check if a file exists in C?
144136
jQuery: Check if image exists
150723
How can I detect a SQL table's existence in Java?
116700
Can I or SHOULD I find an object by the object_id attribute in ruby?
4684
What's the canonical way to check for type in Python?
150261
Alternative to File.exists() in Java
27461
What are valid values for the id attribute in HTML?
21212
How to access object attribute given string corresponding to name of that attribute
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Dynamic instance attributes
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How do I check in SQLite whether a table exists?
66815
What is the correct XPath for choosing attributes that contain "foo"?
148273
Check if event exists on element
9687
Fastest way to determine if record exists
122646
Search if field exists in feature class
83478
Check if a "run-time" multidimensional array key exists
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How to detect existence of a class using SFINAE?