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Checking for the correct number of arguments
How do i check for the correct number of arguments (one argument). If somebody tries to invoke the script without passing in the correct number of arguments, and checking to make sure the command line argument actually exists and is a directory.
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How do I use the conditional operator (? :) in Ruby?
...C (the parenthesis are not required). It's an expression that works like:
if_this_is_a_true_value ? then_the_result_is_this : else_it_is_this
However, in Ruby, if is also an expression so: if a then b else c end === a ? b : c, except for precedence issues. Both are expressions.
Examples:
puts (...
Override intranet compatibility mode IE8
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(to clarify: It works for the document mode, but not browser mode)
– codeulike
Oct 20 '11 at 17:50
21
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Why do we need the “finally” clause in Python?
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It makes a difference if you return early:
try:
run_code1()
except TypeError:
run_code2()
return None # The finally block is run before the method returns
finally:
other_code()
Compare to this:
try:
run_code1()
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When to use IMG vs. CSS background-image?
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Proper uses of IMG
Use IMG if you intend to have
people print your page and you want the image to be included by default.
—JayTee
Use IMG (with alt text) when the image has an important semantic meaning, such as a warning icon. This ensures that th...
C# How can I check if a URL exists/is valid?
...ownloads the historical data, and then plots the price history for the specified ticker symbol.
12 Answers
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How to limit UITableView row reordering to a section
...exPath toProposedIndexPath:(NSIndexPath *)proposedDestinationIndexPath
{
if (sourceIndexPath.section != proposedDestinationIndexPath.section) {
NSInteger row = 0;
if (sourceIndexPath.section < proposedDestinationIndexPath.section) {
row = [tableView numberOfRowsInSection:sourceInd...
Transaction count after EXECUTE indicates a mismatching number of BEGIN and COMMIT statements. Previ
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If you have a TRY/CATCH block then the likely cause is that you are catching a transaction abort exception and continue. In the CATCH block you must always check the XACT_STATE() and handle appropriate aborted and uncommitabl...
How to handle click event in Button Column in Datagridview?
... at MSDN to hardcode the column index or column name in order to determine if a button was clicked. The click event registers for the entire grid, so somehow you need to determine that a button was clicked, but you should not do so by assuming that your button lives in a particular column name or i...
Check if class already assigned before adding
In jQuery, is it recommended to check if a class is already assigned to an element before adding that class? Will it even have any effect at all?
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