operators Archives - Page 7 of 9

What does map(&:name) mean in Ruby?

I found this code in a RailsCast: def tag_names @tag_names || tags.map(&:name).join(' ') end What does the (&:name) in map(&:name) mean? 16 s ...

May 2, 2022
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What is the difference between ‘/’ and ‘//’ when used for division?

Is there a benefit to using one over the other? In Python 2, they both seem to return the same results: >>> 6/3 ...

May 2, 2022
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What’s the difference between equal?, eql?, ===, and ==?

I am trying to understand the difference between these four methods. I know by default that == calls the method equal? which returns ...

April 30, 2022
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“is” operator behaves unexpectedly with integers

Why does the following behave unexpectedly in Python? >>> a = 256 >>> b = 256 >>> a is b True # This ...

April 30, 2022
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What is the use of the @ symbol in PHP?

I have seen uses of @ in front of certain functions, like the following: $fileHandle = @fopen($fileName, $writeAttributes); What is the use of ...

April 29, 2022
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JavaScript plus sign in front of function expression

I’ve been looking for information about immediately invoked functions, and somewhere I stumbled on this notation: +function(){console.log("Something.")}() Can someone explain to me what ...

April 18, 2022
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Behaviour of increment and decrement operators in Python

I notice that a pre-increment/decrement operator can be applied on a variable (like ++count). It compiles, but it does not actually change the ...

April 16, 2022
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What are bitwise shift (bit-shift) operators and how do they work?

I’ve been attempting to learn C in my spare time, and other languages (C#, Java, etc.) have the same concept (and often the ...

April 12, 2022
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Is there a “null coalescing” operator in JavaScript?

Is there a null coalescing operator in Javascript? For example, in C#, I can do this: String someString = null; var whatIWant = ...

April 12, 2022
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What does the ??!??! operator do in C?

I saw a line of C that looked like this: !ErrorHasOccured() ??!??! HandleError(); It compiled correctly and seems to run ok. It seems ...

April 10, 2022
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