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Why is it slower to iterate over a small string than a small list?
...f (index < 0 || index >= PyUnicode_GET_LENGTH(self)) {
PyErr_SetString(PyExc_IndexError, "string index out of range");
return NULL;
}
kind = PyUnicode_KIND(self);
data = PyUnicode_DATA(self);
ch = PyUnicode_READ(kind, data, index);
if (ch < 256)
r...
For each row in an R dataframe
I have a dataframe, and for each row in that dataframe I have to do some complicated lookups and append some data to a file.
...
“var” or no “var” in JavaScript's “for-in” loop?
...
The first version:
for (var x in set) {
...
}
declares a local variable called x. The second version:
for (x in set) {
...
}
does not.
If x is already a local variable (i.e. you have a var x; or var x = ...; somewhere earlier in your current sc...
Comparing two collections for equality irrespective of the order of items in them
...fficiency and edge case checks. plus, it's Microsoft :)
public class MultiSetComparer<T> : IEqualityComparer<IEnumerable<T>>
{
private readonly IEqualityComparer<T> m_comparer;
public MultiSetComparer(IEqualityComparer<T> comparer = null)
{
m_compar...
Detecting an undefined object property
... Any non-default context can also overwrite, say, Math, or Object, or setTimeout, or literally anything that you expect to find in the global scope by default.
– CherryDT
Mar 17 at 21:21
...
Using ls to list directories and their total sizes
..."./" $9]), $0); print $0} }'
Awk code explained:
if($1 == "total") { // Set X when start of ls is detected
X = 1
} else if (!X) { // Until X is set, collect the sizes from `du`
SIZES[$2] = $1
} else {
// Replace the size on current current line (with alignment)
sub($5 "[ ]*", sprintf("%-...
Do you need to use path.join in node.js?
... editor after snippets, if snippets enabled
if (StackExchange.settings.snippets.snippetsEnabled) {
StackExchange.using("snippets", function() {
createEditor();
});
}
else {
createEditor();
...
How to convert a data frame column to numeric type?
How do you convert a data frame column to a numeric type?
18 Answers
18
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How to validate an email address using a regular expression?
Over the years I have slowly developed a regular expression that validates MOST email addresses correctly, assuming they don't use an IP address as the server part.
...
How to suppress “unused parameter” warnings in C?
... course this effects the whole file (and maybe project depending where you set the switch) but you don't have to change any code.
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