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Tag: why

ReactJS – Why does NPM Install React-Native does not work?

I am trying to install react-native through npm install –save react-native for my library so I can export a react component that uses View as a wrapper, and its children are platform-independent .When I try to import react-native, it spews hundreds of lines, saying that it cannot parse the module in react-native

October 20, 2021By Simo React does not work, install, Native, NPM, React, Reactjs, whyLeave a Comment

ReactJS – Why is React need so much node_modules? How to limit loading all these files to make it worth using React?

When I installed react on npm, I got the following folders in node_modules:

> amdefine
>as soon as possible
> base62< br>> core-js
> envify
> esprima-fb
> fbjs
> js-tokens
> jstransform
>loos

October 20, 2021By Simo React React, Reactjs, whyLeave a Comment

Flex 3: Error: Repeater has not been executed … I know why, but I don’t know how to solve it.

I have the following code:

I know you can’t Click to use currentItem or currentIndex… and this problem is fixed by the getRepeaterItem() function, but I am not sure how to use it. DP is a b

October 20, 2021By Simo Flex don't know, error, execution, Flex, how to solve, know, no, repeater, whyLeave a Comment

Regular expression – Why does this frontal assertion does not work when anchored to the beginning of a string?

Why does this post-assertion not work when it is fixed at the front of the string? Run the following code, and you will see that the first test passes, but the second test only passes the ^ anchor

October 18, 2021By Simo Regexp Anchor, assertion, back, expressions, front, inseparable, regular, set, Start, string, This, time, whyLeave a Comment

Why doesn’t my regular expression matching version number does not work?

I am using perl regular expressions to match a problem with a web script I have, and I have managed to put the behavior in a small snippet.

Use this Perl snippet in Perl 5.10.0 in Debian:

October 17, 2021By Simo Regexp does not work, expression, matching, my, regular, this number, version, whyLeave a Comment

Why do we have to recompile the C source code for different operating systems on the same machine?

When I compile my c source code (for example, in a Linux environment), the compiler generates the file in a “machine-readable” format.

>Why can’t the same file run on the same machine under d

October 17, 2021By Simo Os Theory a machine, Different, Operating System, re-compiling, Source Code, we must, whyLeave a Comment

Operating system – Why is the address of the variable remains the same in the modified Fork () system call

Please consider the following code snippet.

if (fork() == 0)
{
a = a + 5;
printf(“%d, %d
“, a, &a);
}
else
{
a = a-5;
printf (“%d, %d
“, a,& a);
} AFAIK, when creating fork(), the paren

October 17, 2021By Simo Os Theory addresses, calls, Fork, Keep, middle, modifications, Operating System, systems, the same, variables, whyLeave a Comment

Why not display color in Iterm2

So I have my gitconfig settings to do colors. In the terminal, it works well and looks good.

However, in iTerm2, all colors will not appear in my gitconfig except for the reverse properties o

October 16, 2021By Simo Macos color, display, ITERM, iterm2, whyLeave a Comment

Why can’t I update to the latest MongoDB using Homebrew?

I installed mongo version 2.0.2 on my Mac, and I installed it using Homebrew. The course I’m using is using the “aggregation” function, which can only be used in version 2.2 of Mongo. I tried to do

October 16, 2021By Simo Macos Homebrew, latest, MongoDB, Unable, Update, use, whyLeave a Comment

Coding style – why DRY is not considered a good thing?

People who seem to never dared to cut and paste code have no problem specifying the type of things over and over again. Why not emphasize that type information should only be declared once, so that

October 15, 2021By Simo Character Coding, DRY, good things, not, statement, style, think is, type, whyLeave a Comment

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