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Why use multiple columns as primary keys (composite primary key)
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Pleas elaborate? Not sure what to say. I have known people that prefer to have multiple concatenated fields as a key because it is easier intuitively to understand what they are looking at. I have known others that prefer just assigning a unique key t...
How to call a function from a string stored in a variable?
... answer below if you are dealing with classes and methods. I didn't expect what I found.
– Chris K
Jan 28 '13 at 23:16
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Are there any worse sorting algorithms than Bogosort (a.k.a Monkey Sort)? [closed]
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What's the big O of this? O(2^N)?
– Mooing Duck
Dec 14 '12 at 17:50
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How to Convert Boolean to String
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This is the easyest way to do it, but it depends on what you need it for it might not be the best sulution.
– Androme
May 8 '10 at 18:43
1
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How can I declare and use Boolean variables in a shell script?
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To explain what is happening: the if statement is executing the contents of the variable which is the Bash builtin true. Any command could be set as the value of the variable and its exit value would be evaluated.
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What is “assert” in JavaScript?
What does assert mean in JavaScript?
14 Answers
14
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What is the difference between the WPF TextBlock element and Label control? [duplicate]
...ck for rendering, as joshsmithonwpf.wordpress.com/2007/07/04/… suggests, what makes a TextBlock slower?
– Mashmagar
May 9 '12 at 14:34
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How to implement a tree data-structure in Java? [closed]
...ng or any other object. It is fairly easy to implement simple trees to do what you need.
All you need to add are methods for add to, removing from, traversing, and constructors. The Node is the basic building block of the Tree.
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What is the purpose of “&&” in a shell command?
...is the logical or, and also ; which is just a separator which doesn't care what happend to the command before.
$ false || echo "Oops, fail"
Oops, fail
$ true || echo "Will not be printed"
$
$ true && echo "Things went well"
Things went well
$ false && echo "Will not be printed"...
What are the special dollar sign shell variables?
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To help understand what do $#, $0 and $1, ..., $n do, I use this script:
#!/bin/bash
for ((i=0; i<=$#; i++)); do
echo "parameter $i --> ${!i}"
done
Running it returns a representative output:
$ ./myparams.sh "hello" "how are you" "...