大约有 48,000 项符合查询结果（耗时：0.0270秒） [XML]
using lodash .groupBy. how to add your own keys for grouped output?
...or": "green",
"age": "77"
}];
console.log(
_.chain(data)
// Group the elements of Array based on `color` property
.groupBy("color")
// `key` is group's name (color), `value` is the array of objects
.map((value, key) => ({ color: key, users: value }))
.value()
)...
Regex Pattern to Match, Excluding when… / Except between
...aintain. It works with all regex flavors that allow you to inspect capture groups in your code. And it happens to answer a number of common questions that may at first sound different from yours: "match everything except Donuts", "replace all but...", "match all words except those on my mom's black ...
How to obtain the query string from the current URL with JavaScript?
...urce = source || this.search;
if ("" != source) {
var groups = source, i;
if (groups.indexOf("?") == 0) {
groups = groups.substr(1);
}
groups = groups.split("&");
for (i in groups) {
source = ...
Android Debug Bridge (adb) device - no permissions [duplicate]
...curity hole.
1.Setting ownership of the adb binary (owner – root, owner group - user_group):
chown root:user_group adb
2.Setting permissions with SUID:
chmod 4550 adb
This should result something similar to this (ls -llh):
-r-sr-x---. 1 root user_name 1.2M Jan 8 11:42 adb
After that you ...
C# LINQ find duplicates in List
...
The easiest way to solve the problem is to group the elements based on their value, and then pick a representative of the group if there are more than one element in the group. In LINQ, this translates to:
var query = lst.GroupBy(x => x)
.Where(g =&g...
Capturing Groups From a Grep RegEx
...of the match are saved to an array called $BASH_REMATCH. The first capture group is stored in index 1, the second (if any) in index 2, etc. Index zero is the full match.
You should be aware that without anchors, this regex (and the one using grep) will match any of the following examples and more, ...
How can I keep Bootstrap popovers alive while being hovered?
...was not requested<br> A placement group is a logical grouping of instances within a single Availability Zone. Using placement groups enables applications to get the full-bisection bandwidth ...
How to count occurrences of a column value efficiently in SQL?
...
This should work:
SELECT age, count(age)
FROM Students
GROUP by age
If you need the id as well you could include the above as a sub query like so:
SELECT S.id, S.age, C.cnt
FROM Students S
INNER JOIN (SELECT age, count(age) as cnt
FROM Students
...
Using JQuery to check if no radio button in a group has been checked
...blem, I need to check with JQuery if no radio button within a radio button group has been checked, so that I can give the users an javascript error if they forgot to check a option.
...
Create an Array of Arraylists
...es"
Instead, you could do:
ArrayList<ArrayList<Individual>> group = new ArrayList<ArrayList<Individual>>(4);
As suggested by Tom Hawting - tackline, it is even better to do:
List<List<Individual>> group = new ArrayList<List<Individual>>(4);
...