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App Inventor 2 中文网VIP专享内容 · App Inventor 2 中文网
...函数式编程轻松实现高级排序算法
【后端源码】PHP 示例的 Node.js 与 Python 对应实现、下载与运行说明
您的改进建议 联系方式： 不需要回复的可留空~ 意见反馈（300字以...
Pry: show me the stack
...personal_site/app/controllers/posts_controller.rb @ line 7 PostsController#index:
5: def index
6: @posts = Post.all
=> 7: binding.pry
8: end
[1] pry(#<PostsController>)> show-stack
Showing all accessible frames in stack (65 in total):
--
=> #0 index <PostsContr...
Reduce git repository size
...ectory can be cleaned too.
Finally, as mentioned in this comment and this question; cleaning the reflog can help:
git reflog expire --all --expire=now
git gc --prune=now --aggressive
An even more complete, and possibly dangerous, solution is to remove unused objects from a git repository
...
How to change package name of an Android Application
My keystore is corrupt, therefore the Android Market is requiring me to rename the app and resubmit it. However, whenever I go to edit the package names in Manifest and throughout the files, it gives me tons of errors.
...
MySQL Conditional Insert
...s the insert instead of updating or inserting a row when you have a unique index on (user, item).
The query will look like this:
INSERT IGNORE INTO x_table(instance, user, item) VALUES (919191, 123, 456)
You can add the unique index with CREATE UNIQUE INDEX user_item ON x_table (user, item).
...
How to reverse a singly linked list using only two pointers?
...y every node.
It looks like your code is on the right track, but it's not quite working in the form above. Here's a working version:
#include <stdio.h>
typedef struct Node {
char data;
struct Node* next;
} Node;
void print_list(Node* root) {
while (root) {
printf("%c ", root->...
A regular expression to exclude a word/string
...noreme3)
You can add as much ignored words as you like, here is a simple PHP implementation:
$ignoredWords = array('ignoreme', 'ignoreme2', 'ignoreme...');
preg_match('~^/\b([a-z0-9]+)\b(?<!' . implode('|', array_map('preg_quote', $ignoredWords)) . ')~i', $string);
...
How to git-cherry-pick only changes to certain files?
...fications you do want
git add <path>
# make the work tree match the index
# (do this from the top level of the repo)
git checkout .
share
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QRCodeGenerator 拓展：根据给定的文本生成二维码 · App Inventor 2 中文网
...+ js + Web浏览器 生成二维码的方案：https://puravidaapps.com/qr.php
方法
GenerateQRCode生成二维码(内容,组件)
把文本内容生成二维码并显示到指定组件（通常用 Image 组件）上。生成成功触发 OnSuccess，失败触发 OnErro...
Dual emission of constructor symbols
... what's this C1? Your duplicate has C2. What does this mean?
Well, this is quite simple too:
<ctor-dtor-name> ::= C1 # complete object constructor
::= C2 # base object constructor
::= C3 # complete object allocating constructor
:...