大约有 46,000 项符合查询结果(耗时:0.1038秒) [XML]

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How to check if an element is in an array

... Swift 2, 3, 4, 5: let elements = [1, 2, 3, 4, 5] if elements.contains(5) { print("yes") } contains() is a protocol extension method of SequenceType (for sequences of Equatable elements) and not a global method as in earlier releas...
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Dictionaries and default values

... Solomon Ucko 2,42022 gold badges1212 silver badges2727 bronze badges answered Feb 20 '12 at 9:44 MattHMattH ...
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How to check if a float value is a whole number

...nt n ... 27 8 1 0 which means that anything over 3 cubed, (including 10648) was missed out due to the aforementioned imprecision: >>> (4**3) ** (1.0/3) 3.9999999999999996 >>> 10648 ** (1.0/3) 21.999999999999996 You'd have to check for numbers close to the whole number instead...
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What is the “double tilde” (~~) operator in JavaScript? [duplicate]

... 4 Answers 4 Active ...
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What is the difference between print and puts?

...already. print does not add a new line. For example: puts [[1,2,3], [4,5,nil]] Would return: 1 2 3 4 5 Whereas print [[1,2,3], [4,5,nil]] would return: [[1,2,3], [4,5,nil]] Notice how puts does not output the nil value whereas print does. ...
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How to express a NOT IN query with ActiveRecord/Rails?

...e this since it seems a lot of people come to this, if you are using Rails 4 look at the answers by Trung Lê` and VinniVidiVicci. ...
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Is there a performance difference between a for loop and a for-each loop?

... From Item 46 in Effective Java by Joshua Bloch : The for-each loop, introduced in release 1.5, gets rid of the clutter and the opportunity for error by hiding the iterator or index variable completely. The resulting idiom ...
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Switch on ranges of integers in JavaScript [duplicate]

...| edited Aug 22 '18 at 10:43 Luca Davanzo 17.9k1212 gold badges9292 silver badges134134 bronze badges an...
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Laravel - Eloquent or Fluent random row

... 624 Laravel >= 5.2: User::inRandomOrder()->get(); or to get the specific number of records //...
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How exactly does tail recursion work?

...lexey Frunze 56.8k99 gold badges6767 silver badges154154 bronze badges 2 ...