language-comparisons

Does Python do variable interpolation similar to “string #{var}” in Ruby?

由 狂风中的少年 提交于 2019-11-27 11:07:11
问题 In Python, it is tedious to write: print "foo is" + bar + '.' Can I do something like this in Python? print "foo is #{bar}." 回答1: Python 3.6+ does have variable interpolation - prepend an f to your string: f"foo is {bar}" For versions of Python below this (Python 2 - 3.5) you can use str.format to pass in variables: # Rather than this: print("foo is #{bar}") # You would do this: print("foo is {}".format(bar)) # Or this: print("foo is {bar}".format(bar=bar)) # Or this: print("foo is %s" % (bar

Is there something in PHP equivalent to LINQ in C#? [closed]

由 一世执手 提交于 2019-11-27 10:26:18
问题 Is there something in PHP equivalent to LINQ in C#? 回答1: There is PHPLinq - LINQ for PHP. 回答2: Try YaLinqo. It is the best LINQ for PHP. Here is a comparison table: 回答3: (YaLinqo developer here.) Currently, there are three major implementations of LINQ in PHP: YaLinqo — the most minimalistic library architecture-wise (4 classes), but the most featureful, the most performant, with the best documentation and the only one supporting "string lambdas". Ginq — a library of average size (70 classes)

Disadvantages of Scala type system versus Haskell?

由 心不动则不痛 提交于 2019-11-27 09:24:26
问题 I have read that Scala's type system is weakened by Java interoperability and therefore cannot perform some of the same powers as Haskell's type system. Is this true? Is the weakness because of type erasure, or am I wrong in every way? Is this difference the reason that Scala has no typeclasses? 回答1: The big difference is that Scala doesn't have Hindley-Milner global type inference and instead uses a form of local type inference, requiring you to specify types for method parameters and the

F# equivalent of `is` keyword in C#?

由 梦想的初衷 提交于 2019-11-27 06:41:29
问题 My first F# day. If I have this: let cat = Animal() Now how do I check at later stage if cat is Animal ? In C# bool b = cat is Animal; In F#? 回答1: @ildjarn deserves the credit here for answering first, but I'm submitting the answer here so it can be accepted. The F# equivalent of the C# is keyword is :? . For example: let cat = Animal() if cat :? Animal then printfn "cat is an animal." else printfn "cat is not an animal." 回答2: For demonstration only (don't define an is function): let is<'T>

Difference between WebStorm and PHPStorm

由 牧云@^-^@ 提交于 2019-11-27 06:07:56
I'm choosing an IDE for Web development and I would like to know what the differences between WebStorm and PHPStorm are? I couldn't find any major points on JetBrains' website and even Google didn't help that much. All I know now is that PHPStorm doesn't support JS like WebStorm, but is able to due to plugins. Is this the only difference? I couldn't find any major points on jetbrains website and even google didn't help that much. You should train your search-fu twice as harder. FROM: http://www.jetbrains.com/phpstorm/ NOTE: PhpStorm includes all the functionality of WebStorm (HTML/CSS Editor,

Does PHP have an equivalent to Python's list comprehension syntax?

由 早过忘川 提交于 2019-11-27 05:34:32
问题 Python has syntactically sweet list comprehensions: S = [x**2 for x in range(10)] print S; [0, 1, 4, 9, 16, 25, 36, 49, 64, 81] In PHP I would need to do some looping: $output = array(); $Nums = range(0,9); foreach ($Nums as $num) { $out[] = $num*=$num; } print_r($out); to get: Array ( [0] => 0 [1] => 1 [2] => 4 [3] => 9 [4] => 16 [5] => 25 [6] => 36 [7] => 49 [8] => 64 [9] => 81 ) Is there anyway to get a similar list comprehension syntax in PHP? Is there anyway to do it with any of the new

What are the differences between Perl, Python, AWK and sed? [closed]

由 孤街浪徒 提交于 2019-11-27 03:57:38
问题 just want to know what are the main differences among them? and the power of each language (where it's better to use it). Edit: it's not "vs." like topic, just information. 回答1: In order of appearance, the languages are sed , awk , perl , python . The sed program is a stream editor and is designed to apply the actions from a script to each line (or, more generally, to specified ranges of lines) of the input file or files. Its language is based on ed , the Unix editor, and although it has

What are the differences between Perl, Python, AWK and sed? [closed]

由 谁说我不能喝 提交于 2019-11-27 02:20:24
just want to know what are the main differences among them? and the power of each language (where it's better to use it). Edit: it's not "vs." like topic, just information. In order of appearance, the languages are sed , awk , perl , python . The sed program is a stream editor, and is designed to apply the actions from a script to each line (or, more generally, to specified ranges of lines) of the input file or files. Its language is based on ed , the Unix editor, and although it has conditionals and so on, it is hard to work with for complex tasks. You can work minor miracles with it - but at

Is there const in C?

由 点点圈 提交于 2019-11-26 18:01:15
问题 This question may be naive, but: is there const keyword in C? since which version? are there any semantic and/or syntactic differences between const in C and C++? 回答1: There are no syntactic differences between C and C++ with regard to const keyword, besides a rather obscure one: in C (since C99) you can declare function parameters as void foo(int a[const]); which is equivalent to void foo(int *const a); declaration. C++ does not support such syntax. Semantic differences exist as well. As

Difference between WebStorm and PHPStorm

由 99封情书 提交于 2019-11-26 09:16:10
问题 I\'m choosing an IDE for Web development and I would like to know what the differences between WebStorm and PHPStorm are? I couldn\'t find any major points on JetBrains\' website and even Google didn\'t help that much. All I know now is that PHPStorm doesn\'t support JS like WebStorm, but is able to due to plugins. Is this the only difference? 回答1: I couldn't find any major points on jetbrains website and even google didn't help that much. You should train your search-fu twice as harder. FROM
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