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Can you grab or delete between parentheses in vi/vim?

... Various Motions: % The % command jumps to the match of the item under the cursor. Position the cursor on the opening (or closing) paren and use y% for yanking or d% for deleting everything from the cursor to the matching paren. This works because % is a...
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In Python how should I test if a variable is None, True or False

... Don't fear the Exception! Having your program just log and continue is as easy as: try: result = simulate(open("myfile")) except SimulationException as sim_exc: print "error parsing stream", sim_exc else: if result: print "result pass" else: print...
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What is the meaning of prepended double colon “::”?

...wered Nov 24 '10 at 16:27 Wyatt AndersonWyatt Anderson 8,42811 gold badge1919 silver badges2424 bronze badges ...
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How to verify an XPath expression in Chrome Developers tool or Firefox's Firebug?

...here for more details): Search in Elements panel like below Execute $x() and $$() in Console panel, as shown in Lawrence's answer Third party extensions (not really necessary in most of the cases, could be an overkill) Here is how you search XPath in Elements panel: Press F12 to open Chrome De...
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What are the main performance differences between varchar and nvarchar SQL Server data types?

... most applications. However, if you need to support double-byte languages and you only have single-byte support in your database schema it's really expensive to go back and modify throughout your application. The cost of migrating one application from varchar to nvarchar will be much more than t...
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What is better, adjacency lists or adjacency matrices for graph problems in C++?

...ts or adjacency matrix, for graph problems in C++? What are the advantages and disadvantages of each? 11 Answers ...
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Cookies vs. sessions

...r the sake of creating a login system for my website, I read about cookies and sessions and their differences (cookies are stored in the user's browser and sessions on the server). At that time, I preferred cookies (and who does not like cookies?!) and just said: "who cares? I don't have any good de...
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SQL: IF clause within WHERE clause

...ion in most cases. In my case, I wanted the change the comparison operator and hence I used the next approach. – Birla Nov 15 '14 at 11:59 ...
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Ignoring time zones altogether in Rails and PostgreSQL

I'm dealing with dates and times in Rails and Postgres and running into this issue: 2 Answers ...
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Return multiple values in JavaScript?

... first: getFirstValue(), second: getSecondValue(), }; } And to access them: var values = getValues(); var first = values.first; var second = values.second; Or with ES6 syntax: const {first, second} = getValues(); * See this table for browser compatibility. Basically, all mod...