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lexers vs parsers
...
What parsers and lexers have in common:
They read symbols of some alphabet from their input.
Hint: The alphabet doesn't necessarily have to be of letters. But it
has to be of symbols which are atomic for the language
understood by parser/lexer.
Symbols ...
Bytecode features not available in the Java language
...uage in mind.
There are some features that are not produced by modern Java compilers, however:
The ACC_SUPER flag:
This is a flag that can be set on a class and specifies how a specific corner case of the invokespecial bytecode is handled for this class. It is set by all modern Java compilers (wher...
Check whether a path is valid in Python without creating a file at the path's target
...lly exist. A pathname is syntactically correct under this definition if it complies with all syntactic requirements of the root filesystem.
By "root filesystem," we mean:
On POSIX-compatible systems, the filesystem mounted to the root directory (/).
On Windows, the filesystem mounted to %HOMEDRIV...
Best way to represent a fraction in Java?
... impossible).
*/
public final class BigFraction extends Number implements Comparable<BigFraction>
{
private static final long serialVersionUID = 1L; //because Number is Serializable
private final BigInteger numerator;
private final BigInteger denominator;
public final static BigFract...
Why does Java switch on contiguous ints appear to run faster with added cases?
...tecode instruction tableswitch).
However, once the JIT starts its job and compiles the bytecode into assembly, the tableswitch instruction does not always result in an array of pointers: sometimes the switch table is transformed into what looks like a lookupswitch (similar to an if/else if structur...
Usage of __slots__?
...ot descriptor has a slot separate from the Wrong's. This shouldn't usually come up, but it could:
>>> w = Wrong()
>>> w.foo = 'foo'
>>> Base.foo.__get__(w)
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
AttributeError: foo
>>>...
Append an object to a list in R in amortized constant time, O(1)?
...ctors too, so do I get the bonus points?
Edit (2015-Feb-01): This post is coming up on its fifth birthday. Some kind readers keep repeating any shortcomings with it, so by all means also see some of the comments below. One suggestion for list types:
newlist <- list(oldlist, list(someobj))
In...
Using Auto Layout in UITableView for dynamic cell layouts & variable row heights
...he height of the table view cell's content view by making sure the content compression resistance and content hugging constraints in the vertical dimension for each subview are not being overridden by higher-priority constraints you have added. (Huh? Click here.)
Remember, the idea is to have the c...
What is TypeScript and why would I use it in place of JavaScript? [closed]
...ig benefits is to enable IDEs to provide a richer environment for spotting common errors as you type the code.
To get an idea of what I mean, watch Microsoft's introductory video on the language.
For a large JavaScript project, adopting TypeScript might result in more robust software, while still ...
布局列表框使用指导 · App Inventor 2 中文网
...行内组件的标签——字典自动绑定、取组件（标签）（GetComponent）都靠它；
把字典列表设给数据（Data）属性，键与组件名相同的项会自动填进组件的
文本（或图片）属性：
when Screen1.Initialize() {
布局列表框1.Data = list(
{ "...