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Javascript when to use prototypes
I'd like to understand when it is appropriate to use prototype methods in js. Should they always be used? Or are there cases where using them is not preferred and/or incurs a performance penalty?
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SQL join: selecting the last records in a one-to-many relationship
Suppose I have a table of customers and a table of purchases. Each purchase belongs to one customer. I want to get a list of all customers along with their last purchase in one SELECT statement. What is the best practice? Any advice on building indexes?
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Does Java casting introduce overhead? Why?
...s there any overhead when we cast objects of one type to another? Or the compiler just resolves everything and there is no cost at run time?
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How to skip “Loose Object” popup when running 'git gui'
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Since nobody had yet an answer, I looked into the code to see how to remove the code which shows up that dialog. I found the hint_gc procedure which does it and the place where it is called. At the same time I noticed that late 2011 there was added a configuration option for disabling the dialog...
What's the difference between --general-numeric-sort and --numeric-sort options in gnu sort
sort provides two kinds of numeric sort. This is from the man page:
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Is there a version of JavaScript's String.indexOf() that allows for regular expressions?
...hat takes a regular expression instead of a string for the first first parameter while still allowing a second parameter ?
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How to move screen without moving cursor in Vim?
I recently discovered Ctrl + E and Ctrl + Y shortcuts for Vim that respectively move the screen up and down with a one line step, without moving the cursor .
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Entity Framework and Connection Pooling
I've recently started to use the Entity Framework 4.0 in my .NET 4.0 application and am curious about a few things relating to pooling.
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What do hjust and vjust do when making a plot using ggplot?
Every time I make a plot using ggplot, I spend a little while trying different values for hjust and vjust in a line like
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How to replace an entire line in a text file by line number
...where I want a bash script to replace an entire line in a file.
The line number is always the same, so that can be a hard-coded variable.
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