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How and why does 'a'['toUpperCase']() in JavaScript work?
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Every JavaScript object is a hash table thus you can access its members by specifying a key. for example, if a variable is a string, then it should has the toUpperCase function. So, you could invoke it by
var str = "a"
str['toUpperCase'](). // you get the m...
Accessing bash command line args $@ vs $*
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Which version is more suitable for a "wrapper" script, where the scripts parameters need to become parameters to a new command?
– Segfault
Mar 30 '15 at 15:53
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Rails extending ActiveRecord::Base
...like this idea because is a standard way of doing it but... I get an error Table 'moboolo_development.abstract_models' doesn't exist: SHOW FIELDS FROM abstract_models. Where should I put it?
– xpepermint
Feb 25 '10 at 7:59
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TransactionManagementError “You can't execute queries until the end of the 'atomic' block” while usi
...onTestCase, on the other hand, is perhaps misleadingly named: it truncates tables to reset the db -- the naming seems to reflect that you can test transactions within a test, not that the test is wrapped as a transaction!
– C S
Sep 20 '18 at 17:40
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Virtual member call in a constructor
...y are constructed, but start out as the most derived type, with the method table being for the most derived type. This means that virtual method calls always run on the most derived type.
When you combine these two facts you are left with the problem that if you make a virtual method call in a cons...
What does the line “#!/bin/sh” mean in a UNIX shell script?
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When you try to execute a program in unix (one with the executable bit set), the operating system will look at the first few bytes of the file. These form the so-called "magic number", which can be used to decide the format of the program and how to execute it.
#! corresponds to the ...
Difference between filter and filter_by in SQLAlchemy
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These code examples are misleading: Declarative base table classes and instances have neither filter nor query methods; they use the session.
– Turtles Are Cute
Mar 16 '16 at 19:45
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Can I make a not submit a form?
...on is a container in HTML. That allows you to place things like images or tables (not sure why you'd do this, but you could) etc while input doesn't support that. There is a difference between the two, and each one has their appropriate use case.
– R0MANARMY
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Are Javascript arrays sparse?
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Yes, they are. They are actually hash tables internally, so you can use not only large integers but also strings, floats, or other objects. All keys get converted to strings via toString() before being added to the hash. You can confirm this with some test code:
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Difference between Pig and Hive? Why have both? [closed]
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Hive was designed to appeal to a community comfortable with SQL. Its philosophy was that we don't need yet another scripting language. Hive supports map and reduce transform scripts in the language of the user's choice (which can be embedded within SQL clauses). It is widel...