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How to explain callbacks in plain english? How are they different from calling one function from ano

How to explain callbacks in plain English? How are they different from calling one function from another function taking some context from the calling function? How can their power be explained to a novice programmer? ...
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CORS - What is the motivation behind introducing preflight requests?

Cross-origin resource sharing is a mechanism that allows a web page to make XMLHttpRequests to another domain (from wikipedia ). ...
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Why are joins bad when considering scalability?

Why are joins bad or 'slow'. I know i heard this more then once. I found this quote 16 Answers ...
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do {…} while(false)

I was looking at some code by an individual and noticed he seems to have a pattern in his functions: 25 Answers ...
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PHP append one array to another (not array_push or +)

How to append one array to another without comparing their keys? 12 Answers 12 ...
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How was the first compiler written?

I heard about the chicken and the egg and bootstrapping. I have a few questions. 6 Answers ...
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How to identify numpy types in python?

How can one reliably determine if an object has a numpy type? 6 Answers 6 ...
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What is the >>>= operator in C?

Given by a colleague as a puzzle, I cannot figure out how this C program actually compiles and runs. What is this >>>= operator and the strange 1P1 literal? I have tested in Clang and GCC. There are no warnings and the output is "???" ...
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What are the differences between Perl, Python, AWK and sed? [closed]

just want to know what are the main differences among them? and the power of each language (where it's better to use it). 5...
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(Deep) copying an array using jQuery [duplicate]

I need to copy an (ordered, not associative) array of objects. I'm using jQuery. I initially tried 8 Answers ...