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Finding differences between elements of a list

Given a list of numbers, how does one find differences between every ( i )-th elements and its ( i+1 )-th? 10 Answers ...
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What is the difference between ${var}, “$var”, and “${var}” in the Bash shell?

What the title says: what does it mean to encapsulate a variable in {} , "" , or "{} "? I haven't been able to find any explanations online about this - I haven't been able to refer to them except for using the symbols, which doesn't yield anything. ...
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HTML table with fixed headers?

Is there a cross-browser CSS/JavaScript technique to display a long HTML table such that the column headers stay fixed on-screen and do not scroll with the table body. Think of the "freeze panes" effect in Microsoft Excel. ...
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Get element inside element by class and ID - JavaScript

Alright, I've dabbled in JavaScript before, but the most useful thing I've written is a CSS style-switcher. So I'm somewhat new to this. Let's say I have HTML code like this: ...
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How do I select text nodes with jQuery?

I would like to get all descendant text nodes of an element, as a jQuery collection. What is the best way to do that? 11 An...
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How to check if an object is nullable?

How do I check if a given object is nullable in other words how to implement the following method... 14 Answers ...
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Callback functions in Java

Is there a way to pass a call back function in a Java method? 17 Answers 17 ...
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Check if a class is derived from a generic class

I have a generic class in my project with derived classes. 16 Answers 16 ...
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How do I know the script file name in a Bash script?

How can I determine the name of the Bash script file inside the script itself? 23 Answers ...
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How do I store an array in localStorage? [duplicate]

If I didn't need localStorage, my code would look like this: 6 Answers 6 ...