Testing for empty or nil-value string
98704
Is There a Better Way of Checking Nil or Length == 0 of a String in Ruby?
144361
string.IsNullOrEmpty(string) vs. string.IsNullOrWhiteSpace(string)
154049
why does if("string") evaluate "string" as true but if ("string"==true) does not?
97235
Test if any columns are NULL
77602
JavaScript validation for empty input field
63172
Checking a null value in Objective-C that has been returned from a JSON string
92195
Why does isEqualToString not work for NSString?
156588
Test if a string contains any of the strings from an array
86355
?: ternary conditional operator behaviour when leaving one expression empty
12323
iPhone : Difference between nil vs Nil and true vs TRUE
129148
How can I memoize a method that may return true, false, or nil in Ruby?
111437
Weak NSString variable is not nil after setting the only strong reference to nil
20684
Test if string is a guid without throwing exceptions?
50081
When should I use nil and NULL in Objective-C?
148793
Checking Textbox Text for Null
128709
Why is there a `null` value in JavaScript?
106258
What is the reason that an empty string evaluates to false in Javascript