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What is tail call optimization?
...lute; there's also TRMC, at least in theory, which would optimize (cons a (foo b)) or (+ c (bar d)) in tail position in the same way.
– Will Ness
Sep 20 '16 at 16:58
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RegEx: Grabbing values between quotation marks
...gt;>> string = '"Foo Bar" "Another Value"'
>>> print re.findall(r'"(.*?)"', string)
['Foo Bar', 'Another Value']
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Javascript reduce on array of objects
...eration 2: a = 3, b = {x:2} returns NaN
A number literal 3 does not (typically) have a property called x so it's undefined and undefined + b.x returns NaN and NaN + <anything> is always NaN
Clarification: I prefer my method over the other top answer in this thread as I disagree with the ide...
How to declare a global variable in a .js file
I need a few global variables that I need in all .js files.
5 Answers
5
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Does JavaScript have “Short-circuit” evaluation?
... in times of JIT-compiling-magic in javascript implementations, one does really want to know if something is "the standard" , or potentially subject to the implementation. The way a condition statement with Binary Logical Operators is evaluated and (short-curcuit) is a standard behavior ecma-interna...
Git Alias - Multiple Commands and Parameters
... into git checkout && git status foo
– Lily Ballard
Sep 23 '11 at 20:13
24
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How do I run two commands in one line in Windows CMD?
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Like this on all Microsoft OSes since 2000, and still good today:
dir & echo foo
If you want the second command to execute only if the first exited successfully:
dir && echo foo
The single ampersand (&) syntax to exe...
Is there any difference between the `:key => “value”` and `key: “value”` hash notations?
... 'pancakes house?' }
The JavaScript style (key: value) is only useful if all of your Hash keys are "simple" symbols (more or less something that matches /\A[a-z_]\w*\z/i, AFAIK the parser uses its label pattern for these keys).
The :$in style symbols show up a fair bit when using MongoDB so you'l...
JAX-RS — How to return JSON and HTTP status code together?
...here is how to set the response code to CREATED when appropriate.
@Path("/foos/{fooId}")
@PUT
@Consumes("application/json")
@Produces("application/json")
public Foo setFoo(@PathParam("fooID") final String fooID, final Foo foo, @Context final HttpServletResponse response)
{
//TODO store foo in per...
Which is better, return value or out parameter?
...ery rare exception to this rule.)
Aside from anything else, it stops the caller from having to declare the variable separately:
int foo;
GetValue(out foo);
vs
int foo = GetValue();
Out values also prevent method chaining like this:
Console.WriteLine(GetValue().ToString("g"));
(Indeed, that...