大约有 40,000 项符合查询结果（耗时：0.0388秒） [XML]
How to print the values of slices
...t (instead of []Project), you are better off defining a String() method in order to display exactly what you want to see (or you will see only pointer address).
See this play.golang example.
share
|
...
Disabling swap files creation in vim
...
You can set backupdir and directory to null in order to completely disable your swap files, but it is generally recommended to simply put them in a centralized directory. Vim takes care of making sure that there aren't name collissions or anything like that; so, this is a...
Assign multiple columns using := in data.table, by group
...r this answer and the examples. How should I modify the following line in order to get two columns for each objectName from the dim output, rather than one column with two rows? data.table(objectName=ls())[,c("rows","cols"):=dim(get(objectName)),by=objectName] (I'm using data.table 1.8.11)
...
What is the difference between README and README.md in GitHub projects?
... see at the bottom of projects. Github has their own flavor of Markdown.
Order of Preference: If you have two files named README and README.md, the file named README.md is preferred, and it will be used to generate github's html summary.
FWIW, Stack Overflow uses local Markdown modifications as...
What's the safest way to iterate through the keys of a Perl hash?
...may work for some data sets but will fail for others depending on the hash order.
As already noted, it is safe to delete the last key returned by each. This is not true for keys as each is an iterator while keys returns a list.
...
What's “tools:context” in Android layout files?
...ction; an activity can call setContentView(layout) to display a layout) in order to drive certain features.
Right now, we're using it for one thing only: Picking the right theme to show for a layout (since the manifest file can register themes to use for an activity, and once we know the activity a...
Ansible: Set variable to file content
...
You can use lookups in Ansible in order to get the contents of a file, e.g.
user_data: "{{ lookup('file', user_data_file) }}"
Caveat: This lookup will work with local files, not remote files.
Here's a complete example from the docs:
- hosts: all
vars:
...
Java logical operator short-circuiting
...when the right-hand operand depends on the left one being true or false in order to function properly.
For example, the following code fragment shows how you can take advantage of short-circuit logical evaluation to be sure that a division operation will be valid before evaluating it:
if ( denom !...
Is there still any reason to learn AWK?
...
+1 Sold. I am going to order this book. I have used awk for years as a quick and powerful one-liner scripting language. Awk is a great pre-processor for files that would otherwise take a dozen lines to code. I cannot count how many times I have use...
Is it possible to create static classes in PHP (like in C#)?
...push the session to the database.
Another advantage is you can ignore the order you call things as everything will be setup on demand.
class Factory {
static function &getDB ($construct_params = null)
{
static $instance;
if( ! is_object($instance) )
{
...