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Groovy: what's the purpose of “def” in “def x = 0”?

In the following piece of code (taken from the Groovy Semantics Manual page ), why prefix the assignment with the keyword def ? ...
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How to make a transparent HTML button?

... So, your actual question is very different from the original one that I responded to. You already know how to use CSS to make the button transparent. After it has been clicked on, it's leaving a border you don't want. Is that accurate? – EnigmaRM...
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How to create a protocol with methods that are optional?

... From the Apple page on "Formal Protocols": Optional Protocol methods can be marked as optional using the @optional keyword. Corresponding to the @optional modal keyword, there is a @required keyword to formally...
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Control the size of points in an R scatterplot?

..." and 19. It's a filled symbol (which is probably what you want). Aside from that, even the base graphics system in R allows a user fine-grained control over symbol size, color, and shape. E.g., dfx = data.frame(ev1=1:10, ev2=sample(10:99, 10), ev3=10:1) with(dfx, symbols(x=ev1, y=ev2, circles=...
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Passing a function with parameters as a parameter?

...age) { alert(message); } In this example the "parameter value" is passed from function1 to function3 through function2 using a function wrap. share | improve this answer | ...
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Drop a temporary table if it exists

... From SQL Server 2016 you can just use DROP TABLE IF EXISTS ##CLIENTS_KEYWORD On previous versions you can use IF OBJECT_ID('tempdb..##CLIENTS_KEYWORD', 'U') IS NOT NULL /*Then it exists*/ DROP TABLE ##CLIENTS_KEYWORD CRE...
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What is the difference between shallow copy, deepcopy and normal assignment operation?

... functions the same as a shallow copy in this example. Deep copies differ from shallow copies in that shallow copies will make a new copy of the object itself, but any references inside that object will not themselves be copied. In your example, your list has only integers inside it (which are imm...
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What does the -ObjC linker flag do?

...bjective-C static libraries that contain categories on existing classes. From this Technical Q&A share | improve this answer | follow | ...
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How to find the length of a string in R

... Or use stri_length from stringi - it works fine with NA's and it is faster :) Check my post! – bartektartanus Apr 4 '14 at 16:37 ...
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The 'packages' element is not declared

... Taken from this answer. Close your packages.config file. Build Warning is gone! This is the first time I see ignoring a problem actually makes it go away... Edit in 2020: if you are viewing this warning, consider upgrading...