大约有 47,000 项符合查询结果(耗时:0.0508秒) [XML]

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Which would be better for concurrent tasks on node.js? Fibers? Web-workers? or Threads?

... mean that it lacks things. For a synchronous job (where we can decide the order and way of processing), it works as well as multi-threaded parallelism. For a job that comes from outside like requests to a server, it simply is superior. (1) Unless you are building libraries in other languages lik...
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Drop unused factor levels in a subsetted data frame

... Also: this method does preserve the ordering of the variable. – webelo Jul 1 '16 at 0:36  |  show 1 mor...
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Redirect Windows cmd stdout and stderr to a single file

...y "cmd" parses commands that gives two different meanings depending on the order in which you specify the redirection. But are the semantic rules documented anywhere because I reckon this is something worthwhile to learn as it could waste hours. – igbgotiz Jul ...
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PHP PDO returning single row

...string goes here" ); $STH - $DBH -> prepare( "select figure from table1 ORDER BY x LIMIT 1" ); $STH -> execute(); $result = $STH -> fetch(); echo $result ["figure"]; $DBH = null; You can use fetch and LIMIT together. LIMIT has the effect that the database returns only one entry so PHP h...
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When and why should I use a namedtuple instead of a dictionary? [duplicate]

...dname': firstvalue, 'secondfield': secondvalue} Finally, namedtuples are ordered, unlike regular dicts, so you get the items in the order you defined the fields, unlike a dict. share | improve thi...
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Iterate over a Javascript associative array in sorted order

...nary-like object should I use if I want to iterate over the keys in sorted order?" then you might develop an object like this: var a = { keys : new Array(), hash : new Object(), set : function(key, value) { if (typeof(this.hash[key]) == "undefined") { this.keys.push(key); } this.hash[...
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Why does MSBuild look in C:\ for Microsoft.Cpp.Default.props instead of c:\Program Files (x86)\MSBui

... For those who didn't follow the MS proscribed order (see Xv's answer) you can still fix the problem. MSBuild uses the VCTargetsPath to locate default cpp properties but cannot because the registry lacks this String Value. Check for the String Value Launch regedit Na...
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Why Would I Ever Need to Use C# Nested Classes [duplicate]

...this ... class A { //B is used to help implement A class B { ...etc... } ...etc... } ... you can always move the inner/nested class to global scope, like this ... class A { ...etc... } //B is used to help implement A class B { ...etc... } However, when B is only used to help...
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Are parameters in strings.xml possible? [duplicate]

... The order is not as important as you say. The numbers in the string is actually the order of the parameter. Depending on language you could have the numbers in different order. – Flaxie Jan ...
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C: Run a System Command and Get Output? [duplicate]

... want the "popen" function. Here's an example of running the command "ls /etc" and outputing to the console. #include <stdio.h> #include <stdlib.h> int main( int argc, char *argv[] ) { FILE *fp; char path[1035]; /* Open the command for reading. */ fp = popen("/bin/ls /etc/"...