query: How can I check the variable whether it exists or not
positive_passages.docid: 27606
positive_passages.text: Detecting an undefined object property
negative_passages.docid: 73550
negative_passages.text: Checking if a URL exists or not
negative_passages.docid: 94841
negative_passages.text: How can I compare a dynamic variable with a literal in Mathematica?
negative_passages.docid: 90956
negative_passages.text: Check if element exists in jQuery
negative_passages.docid: 89549
negative_passages.text: Can anyone explain this 'variable does not exist error'?
negative_passages.docid: 90853
negative_passages.text: How can I compare multiple variables to a single condition?
negative_passages.docid: 50695
negative_passages.text: PHP MySql - Check if value exists
negative_passages.docid: 6288
negative_passages.text: How do I check if an object has a specific property in JavaScript?
negative_passages.docid: 149877
negative_passages.text: How to check if a directory exists in Objective-C
negative_passages.docid: 42004
negative_passages.text: What is the PHP shorthand for: print var if var exist
negative_passages.docid: 1541
negative_passages.text: How do I check in SQLite whether a table exists?
negative_passages.docid: 53248
negative_passages.text: Check variable equality against a list of values
negative_passages.docid: 105531
negative_passages.text: Determining if a variable is within range?
negative_passages.docid: 5307
negative_passages.text: Check if a variable is in an ad-hoc list of values
negative_passages.docid: 96317
negative_passages.text: How to check type of variable in Java?
negative_passages.docid: 102826
negative_passages.text: Easy way to check that a variable is defined in python?
negative_passages.docid: 71634
negative_passages.text: Can a variable be defined only in the scope of an if-statement, similar to how it's often done for for-loops?