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Which is more efficient, a for-each loop, or an iterator?
... = new ArrayList<Integer>();
for (Integer integer : a)
{
integer.toString();
}
// Byte code
ALOAD 1
INVOKEINTERFACE java/util/List.iterator()Ljava/util/Iterator;
ASTORE 3
GOTO L2
L3
ALOAD 3
INVOKEINTERFACE java/util/Iterator.next()Ljava/lang/Object;
CHECKCAST java/lang/Integer
ASTORE...
How to check 'undefined' value in jQuery
...platform:
if (typeof value === "undefined") {
// ...
}
It returns a string indicating the type of the variable or other unevaluated operand. The main advantage of this method, compared to if (value === undefined) { ... }, is that typeof will never raise an exception in case if variable value ...
StringIO in Python3
I am using Python 3.2.1 and I can't import the StringIO module. I use
io.StringIO and it works, but I can't use it with numpy 's genfromtxt like this:
...
Concrete Javascript Regex for Accented Characters (Diacritics)
I've looked on Stack Overflow ( replacing characters.. eh , how JavaScript doesn't follow the Unicode standard concerning RegExp , etc.) and haven't really found a concrete answer to the question:
...
What's the difference between and , and ?
...
<strong> and <em> add extra semantic meaning to your document. It just so happens that they also give a bold and italic style to your text.
You could of course override their styling with CSS.
<b> and <i> on the other hand only apply...
How can I render inline JavaScript with Jade / Pug?
...ersion 7.0
The docs says you should use a script tag now, followed by a . char and no preceding space.
Example:
script.
if (usingJade)
console.log('you are awesome')
else
console.log('use jade')
will be compiled to
<script>
if (usingJade)
console.log('you are awesome')
...
“is” operator behaves unexpectedly with integers
...
This can be a very fast check relative to say, checking if two very long strings are equal in value. But since it applies to the uniqueness of the object, we thus have limited use-cases for it. In fact, we mostly want to use it to check for None, which is a singleton (a sole instance existing in o...
How to put multiple statements in one line?
...t I just want the code to continue running ... for instance, to check if a string can be an integer try: int(string) ... If it can't, then just continue to the next line, no need for an exception. I see what you're saying, but is there any other way that can accommodate for this type of checking/err...
What does = +_ mean in JavaScript
... to converts it into a number, if it isn't
already. [...] It can convert string representations of integers and
floats, as well as the non-string values true, false, and null.
Integers in both decimal and hexadecimal ("0x"-prefixed) formats are
supported. Negative numbers are supported (thou...
How to vertically align text inside a flexbox?
...-items: baseline. Good for different heights coming from different unicode chars etc.
– qräbnö
Jan 7 '19 at 16:50
1
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