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What is the !! (not not) operator in JavaScript?
I saw some code that seems to use an operator I don't recognize, in the form of two exclamation points, like so: !! . Can someone please tell me what this operator does?
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Possible to iterate backwards through a foreach?
I know I could use a for statement and achieve the same effect, but can I loop backwards through a foreach loop in C#?
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How to draw polygons on an HTML5 canvas?
I need to know how to draw polygons on a canvas. Without using jQuery or anything like that.
9 Answers
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Null vs. False vs. 0 in PHP
I am told that good developers can spot/utilize the difference between Null and False and 0 and all the other good "nothing" entities.
What is the difference, specifically in PHP? Does it have something to do with === ?
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How to find out if a Python object is a string?
How can I check if a Python object is a string (either regular or Unicode)?
15 Answers
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Checking if a field contains a string
I'm looking for an operator, which allows me to check, if the value of a field contains a certain string.
10 Answers
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How to populate/instantiate a C# array with a single value?
I know that instantiated arrays of value types in C# are automatically populated with the default value of the type (e.g. false for bool, 0 for int, etc.).
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Oracle: how to UPSERT (update or insert into a table?)
The UPSERT operation either updates or inserts a row in a table, depending if the table already has a row that matches the data:
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How to write the Fibonacci Sequence?
I had originally coded the program wrongly. Instead of returning the Fibonacci numbers between a range (ie. startNumber 1, endNumber 20 should = only those numbers between 1 & 20), I have written for the program to display all Fibonacci numbers between a range (ie. startNumber 1, endNumber 20 displa...
C++ IDE for Linux? [closed]
I want to expand my programming horizons to Linux. A good, dependable basic toolset is important, and what is more basic than an IDE?
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