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How to move out of auto-completed brackets in IntelliJ IDEA (without using the arrow keys)?
...ng parenthesis), and it will move your cursor outside of the parenthesis.
String asdf = "hello world";
System.out.println(asdf);
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Why is arr = [] faster than arr = new Array?
...Y_INIT from an object property accessor (e.g. obj[foo]) or brackets inside strings/regex literals (e.g. "foo[]bar" or /[]/)
This is miniscule, but we also have more tokens with new Array. Furthermore, it's not entirely clear yet that we simply want to create an array. We see the "new" token, but "...
How to implement a rule engine?
... all operators before compiling the rules:
var nameMap = new Dictionary<string, string> {
{ "greater_than", "GreaterThan" },
{ "hasAtLeastOne", "Contains" }
};
The code uses the type User for simplicity. You can replace User with a generic type T to have a generic Rule compiler for an...
Clicking the text to select corresponding radio button
...
Another option to avoid the extra space between the radio button and label, is to simply not put it there <input id="349" type="radio" value="1" name="question1"><label for="349"> Abe</label> (no spaces or newlines between the tags)
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Eager load polymorphic
...w you join a table named by the value stored in a column. By defining the extra relationship belongs_to :shop, you are giving ActiveRecord the information it needs to complete the join.
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Creating JS object with Object.create(null)?
... in the map that you never inserted. For example, if you did a lookup on toString, you would find a function, even though you never put that value there. You can work around that like this:
if (Object.prototype.hasOwnProperty.call(p, 'toString')) {
// we actually inserted a 'toString' key into p...
How to exclude certain directories/files from git grep search
... separate list $moved. I had issues with whitespace in
# the search-string, so this is loosely based on:
# http://www.linuxjournal.com/content/bash-preserving-whitespace-using-set-and-eval
x=1 ...
When is SQLiteOpenHelper onCreate() / onUpgrade() run?
...atabase file.
catch is the constructor
SQLiteOpenHelper(Context context, String name, SQLiteDatabase.CursorFactory factory, int version)
So when the database helper constructor is called with a name (2nd param), platform checks if the database exists or not and if the database exists, it gets th...
When to add what indexes in a table in Rails
...add:
add_index :photos, [:created_at, :version]
Note:
An index takes up extra space on the disk and makes it slower to create and update each record, because it has to rebuild each index.
Credit:
https://tomafro.net/2009/08/using-indexes-in-rails-choosing-additional-indexes, rails - created_at ...
Quick easy way to migrate SQLite3 to MySQL? [closed]
...esn't use quotes inside the schema definition
MySQL uses single quotes for strings inside the INSERT INTO clauses
SQLite and MySQL have different ways of escaping strings inside INSERT INTO clauses
SQLite uses 't' and 'f' for booleans, MySQL uses 1 and 0 (a simple regex for this can fail when you ha...