Recent questions tagged Syntax

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syntax - Can you splat positional arguments in PowerShell?

Does PowerShell support splatting of positional arguments as opposed to named parameters? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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913 views

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syntax - jq special characters in nested keys

I have a json similar to the following: { "_source" : { "index-pattern" : { "fields" : "" } } } I'm ... "] ^ 1 compile error' Any ideas? thanks See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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696 views

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syntax - Nested dereferencing arrows in Perl: to omit or not to omit?

In Perl, when you have a nested data structure, it is permissible to omit de-referencing arrows to 2d ... subscripts from one another. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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958 views

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syntax - Fill array with values without loop in PHP

Is there any method (that doesn't use loop or recursion) to create and fill an array with values? To be precise, I ... ] = "val"; } But simpler. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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941 views

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syntax - What does (char *)0 mean in c?

if ( fgets( line, sizeof(line), stdin ) == (char*) 0 )... I don't understand what this line does,anyone knows? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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958 views

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syntax error - C# The name ' ... ' doesn't exist in the current context

I'm new in C# and I try to learn it from the very basics, but I stuck with classes. I made my first example to ... ! } Console.ReadLine(); } } } See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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syntax error - Why am I getting a SyntaxError in the Python interpreter?

This code works when I try it from a .py file, but fails in the command line interpreter and Idle. >>> try: ... syntax I'm using python 2.6 See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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675 views

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syntax - What is the reason for error while returning a structure in this C program?

My program intends to achieve this (A) Write a C function named larger() that returns the later date of any two dates ... ;} return (more[0]); } See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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syntax - Order of function modifiers in C#

I would like to know if there is a standard to set the order of function modifiers in C#. i.e. public ... and Method must have a return type See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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765 views

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syntax - When are closing tags required with Android view markup?

For some Android XML attributes, you don't conclude the opening tag with a '>' until after you' ... between these different components? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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666 views

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syntax - In Ruby, why is a method invocation not able to be treated as a unit when "do" and "end" is used?

The following question is related to the question "Ruby Print Inject Do Syntax". My question is, can we insist on ... can it be made to work? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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syntax - Typed arrays in TypeScript - what is the difference between Array<Foo> and Foo[]?

In TypeScript I have a class Foo class Foo {} I want array of instances of Foo. What is the difference between ... do I correctly refer to them? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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761 views

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syntax - How to assign and reference environment variables containing square brackets in Powershell

When the PSDrive is not specified, the following works: ${[foo]}="bar" echo ${[foo ... ,Microsoft.PowerShell.Commands.SetItemCommand See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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825 views

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syntax error - LibCurl CURLOPT_URL not accepting string? C++

So basically what I want to do is use libcurl to fetch slightly different urls, e.g.: http://foo.com/foo. ... to Andrew. Why does that happen? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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649 views

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syntax - What's the difference between ref and & when assigning a variable from a reference?

What is wrong with this code? fn example() { let vec = vec![1, 2, 3]; let &_y = &vec; } error[E0507]: cannot ... 1, 2, 3]; let ref _y = &vec; See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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744 views

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syntax - Pattern matching equivalent variables in Haskell, like in Prolog

In prolog, we can do something like the following: myFunction a (a:xs) = ... This is, when the 1st ... the above trick will simply not do. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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691 views

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syntax - Is there a speed difference between <?php echo $var; ?> and <?=$var?>?

Is there any speed difference between these two versions? <?php echo $var; ?> <?=$var?> Which do you recommend, and why? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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813 views

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syntax - Using the F# pipe symbol with an object constructor

I'm trying to figure out the correct syntax to use the pipe operator |> into the creation of an object. Currently ... ) |> Array.concat |> Shape See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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741 views

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syntax - Is there a difference between :: and . when calling class methods in Ruby?

Simple question, but one that I've been curious about...is there a functional difference between the following two ... reason for this is... See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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747 views

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syntax - Assignment of two values in parentheses in C

What does this piece of code in C do: p = (1, 2.1); What do we know about p? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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952 views

1 answer

syntax - Clojure: What does [_] do in a Functions Argument List?

I am working through the joy of clojure and am wondering what the _ syntax does in a functions argument vector. ... [_ exec-count] (func)) See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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696 views

1 answer

syntax - What is different between @+id/android:list and @id/android:list?

I've develop android application, and one question. As you know, When we use LiveActivity, we must specify @id/ ... and @id/android:list ?? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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850 views

1 answer

syntax - Groovy range with a 0.5 step size

What's the most elgant way in Groovy to specify a range of integers and the 0.5 steps between them? e.g.: 1 ... suppose a list would be OK too. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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1.1k views

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syntax - What does `~` mean in Haskell?

I'm studying the mtl library and trying to do some MonadTransformers of my own. I was checking the Control.Monad. ... does this ~ operand mean? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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862 views

1 answer

syntax - What does it mean += in Python?

What does it mean when it's like this: self.something += ('somethin',) What does "+=" mean and what does the comma mean? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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674 views

1 answer

syntax - "Slicing" in Python Expressions documentation

I don't understand the following part of the Python docs: http://docs.python.org/reference/expressions. ... built-in Ellipsis object. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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844 views

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syntax - C type casts and addition precedence

What's the precedence in the next expression? item = (char*)heap + offset; Is it (char*)(heap + offset) or ((char*)heap) + offset? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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616 views

1 answer

syntax - Why does Javascript's OR return a value other than true/false?

I saw this construction in order to get the browser viewport width: function () { return window.innerWidth || ... explain what's going on? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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