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Simple regular expression for a decimal with a precision of 2
...okens vary by implementation. A generic form is:
[0-9]+(\.[0-9][0-9]?)?
More compact:
\d+(\.\d{1,2})?
Both assume that both have at least one digit before and one after the decimal place.
To require that the whole string is a number of this form, wrap the expression in start and end tags such...
CSS to stop text wrapping under image
...e to change its width.
display: block;
Another way, which usually makes more sense, is to use a <p> element as a parent for your <span>.
<li id="CN2787">
<img class="fav_star" src="images/fav.png">
<p>
<span>Text, text and more text</span>
&lt...
Should I instantiate instance variables on declaration or in the constructor?
...s actually put in the constructor(s) by the compiler.
The first variant is more readable.
You can't have exception handling with the first variant.
There is additionally the initialization block, which is as well put in the constructor(s) by the compiler:
{
a = new A();
}
Check Sun's explana...
What are the benefits of functional programming? [closed]
...function has been done on all the elements."
Functional programming moves more basic programming ideas into the compiler, ideas such as list comprehensions and caching.
The biggest benefit of Functional programming is brevity, because code can be more concise. A functional program doesn't create a...
How do I reverse an int array in Java?
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Find the min/max element of an Array in JavaScript
...lt-ins can cause collisions with other libraries (some see), so you may be more comfortable with just apply'ing Math.xxx() to your array directly:
var min = Math.min.apply(null, arr),
max = Math.max.apply(null, arr);
Alternately, assuming your browser supports ECMAScript 6, you can use the ...
Ruby, remove last N characters from a string?
...e.
If you know what the suffix is, this is idiomatic (and I'd argue, even more readable than other answers here):
'abc123'.delete_suffix('123') # => "abc"
'abc123'.delete_suffix!('123') # => "abc"
It's even significantly faster (almost 40% with the bang method) than the top answer. ...
How to check if a variable is set in Bash?
...
Using a simple [ -z $var ] is no more "wrong" than omitting quotes. Either way, you're making assumptions about your input. If you are fine treating an empty string as unset, [ -z $var ] is all you need.
– nshew
May 5 '...
Accessing the index in 'for' loops?
...r idx, val in enumerate(ints):
print(idx, val)
Check out PEP 279 for more.
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What actually causes a Stack Overflow error? [duplicate]
...hat an OutOfMemoryError is to the heap: it simply signals that there is no more memory available.
Description from Virtual Machine Errors (§6.3)
StackOverflowError: The Java Virtual Machine implementation has run out of stack space for a thread, typically because the thread is doing an unbound...