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What is the “right” way to iterate through an array in Ruby?
... way to iterate, useful when you want to transform one array into another.
select is the iterator to use when you want to choose a subset.
inject is useful for generating sums or products, or collecting a single result.
It may seem like a lot to remember, but don't worry, you can get by without k...
gulp globbing- how to watch everything below directory
...lly been able to find a satisfactory answer: How do I use gulp globbing to select all files in all subdirectories below a certain directory?
...
Detect changes in the DOM
... (click to delete)</button></li>",
listElm = document.querySelector('ol');
document.querySelector('body > button').onclick = function(e){
listElm.insertAdjacentHTML("beforeend", itemHTML);
}
// delete item
listElm.onclick = function(e){
if( e.target.nodeName == "BUTTON" )
...
What is the gain from declaring a method as static
...ic method dispatch, the thing happening while exetucing object.method() to select the method to call.
– Marko Topolnik
Jun 28 '12 at 10:03
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Relational Database Design Patterns? [closed]
... codepages.
Give every column a unique name. This make it easer on join to select the column. It is very difficult if every table has a column "ID" or "Name" or "Description". Use XyzID and AbcID.
Use a resource bundle or equals for complex SQL expressions. It make it easer to switch to another DBMS...
Track all remote git branches as local branches
...it branch --set-upstream-to $remote/$brname $brname;
done
it will only select upstream branches from the remote you specify in the remote variable (it can be 'origin' or whatever name you have set for one of the remotes of your current Git repo).
it will extract the name of the branch: origin/a/...
Remove unwanted parts from strings in a column
...
A very simple method would be to use the extract method to select all the digits. Simply supply it the regular expression '\d+' which extracts any number of digits.
df['result'] = df.result.str.extract(r'(\d+)', expand=True).astype(int)
df
time result
1 09:00 52
2 10:00...
In log4j, does checking isDebugEnabled before logging improve performance?
...g statement you will already have the check in place.
2- You don't have to selectively include the statement on "complex" debug statements. All statements are included that way.
3- Calling log.debug executes the following before logging:
if(repository.isDisabled(Level.DEBUG_INT))
retur...
How to get a string after a specific substring?
...ram.
This script generates random sentences with and without the randomly selected delimiter present, and if present, at different positions in the generated sentence, runs the tests in random order with repeats (producing the fairest results accounting for random OS events taking place during test...
How can I get the external SD card path for Android 4.0+?
...e directory mnt first and work from there..
You should use some type of selection method to choose which sdcard to use:
File storageDir = new File("/mnt/");
if(storageDir.isDirectory()){
String[] dirList = storageDir.list();
//TODO some type of selecton method?
}
...