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How do I dump an object's fields to the console?
...e_methods from the class' in question to get the methods that are unique: (String.instance_methods - Object.instance_methods).sort
– the Tin Man
Nov 27 '10 at 22:05
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Test if string is a number in Ruby on Rails
...
Create is_number? Method.
Create a helper method:
def is_number? string
true if Float(string) rescue false
end
And then call it like this:
my_string = '12.34'
is_number?( my_string )
# => true
Extend String Class.
If you want to be able to call is_number? directly on the string...
Replacing Spaces with Underscores
...This would avoid beginning and ending with white spaces.
$trimmed = trim($string); // Trims both ends
$convert = str_replace('', '_', $trimmed);
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How to write a multidimensional array to a text file?
...[i,:,:] in this case
for data_slice in data:
# The formatting string indicates that I'm writing out
# the values in left-justified columns 7 characters in width
# with 2 decimal places.
np.savetxt(outfile, data_slice, fmt='%-7.2f')
# Writing out a brea...
Multiple file upload in php
...sure to look for empty file names and paths, the array might contain empty strings. Use array_filter() before count.
Here is a down and dirty example (showing just relevant code)
HTML:
<input name="upload[]" type="file" multiple="multiple" />
PHP:
//$files = array_filter($_FILES['upload...
Where and how is the _ViewStart.cshtml layout file linked?
...his in the view engine ViewLocationFormats = ViewLocationFormats.Union(new string[] { "~/Inspinia/ExampleViews/{1}/{0}.cshtml" }).ToArray();. As a result, I had to add a copy of my _ViewStart.cshtml file to "~/Inspinia/ExampleViews", otherwise it was not picked up and no layout was set.
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How should I read a file line-by-line in Python?
...ndle when it collects the file object, therefore as long as you don't have extra references to the file object and you don't disable GC and you're not opening many files in quick succession, you're unlikely to get "too many files open" due to not closing the file.
– Lie Ryan
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How do I make a list of data frames?
...f data frames here are three good choices:
# base option - slower but not extra dependencies
big_data = do.call(what = rbind, args = df_list)
# data table and dplyr have nice functions for this that
# - are much faster
# - add id columns to identify the source
# - fill in missing values if some...
How do getters and setters work?
...utorial is not really required for this. Read up on encapsulation
private String myField; //"private" means access to this is restricted
public String getMyField()
{
//include validation, logic, logging or whatever you like here
return this.myField;
}
public void setMyField(String value)
...
How to prevent SIGPIPEs (or handle them properly)
...mple replacing write(...) by send(...,MSG_NOSIGNAL) (see nobar's comment)
char buf[888];
//write( sockfd, buf, sizeof(buf) );
send( sockfd, buf, sizeof(buf), MSG_NOSIGNAL );
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