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Replace specific characters within strings
..., "e18947")) )
R> group
group
1 12357e
2 12575e
3 197e18
4 e18947
Now use gsub() with the simplest possible replacement pattern: empty string:
R> group$groupNoE <- gsub("e", "", group$group)
R> group
group groupNoE
1 12357e 12357
2 12575e 12575
3 197e18 19718
4 e18947 ...
Why use bzero over memset?
...use you can achieve exactly the same functionality using memset function.
Now regarding efficiency, compilers like gcc use builtin implementations for memset which switch to a particular implementation when a constant 0 is detected. Same for glibc when builtins are disabled.
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differences in application/json and application/x-www-form-urlencoded
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@buffer I'm also curious to know the answer to your symmetric question.
– Adam Johns
Oct 14 '14 at 14:14
1
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Get first key in a (possibly) associative array?
...
@donquixote I don't know for sure, but assuming it's a regular array (and not an object implementing some kind or Iterator interface), I'm fairly sure foreach doesn't create an internal copy for it, but rather just iterates a pointer, similar to ...
Why is volatile needed in C?
...ef struct
{
int command;
int data;
int isbusy;
} MyHardwareGadget;
Now you want to send some command:
void SendCommand (MyHardwareGadget * gadget, int command, int data)
{
// wait while the gadget is busy:
while (gadget->isbusy)
{
// do nothing here.
}
// set data first:
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How to send POST request?
... Thanks @xilopaint and ArashHatami for the syntax error. Corrected now.
– Pranzell
Jun 19 '19 at 13:16
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What's so wrong about using GC.Collect()?
...that respectable programmers wouldn't ever use, even those who don't even know what it is for.
20 Answers
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How to use JavaScript variables in jQuery selectors?
... method = $this.data('method') || 'hide';
target[method]();
});
Now you can completely control which element you're targeting and what happens to it via the HTML. For example, you could use data-target=".some-class" and data-method="fadeOut" to fade-out a collection of elements.
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How to write a Unit Test?
...ne the expected and desired output for a normal case, with correct input.
Now, implement the test by declaring a class, name it anything (Usually something like TestAddingModule), and add the testAdd method to it (i.e. like the one below) :
Write a method, and above it add the @Test annotation.
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How to rollback just one step using rake db:migrate
... step, I think using VERSION=n is the right way to do that, but I don't know the correct value of n to use. Is there any command to check the current n value?
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