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Easiest way to check for an index or a key in an array?
... dollar symbol ($) is not required, but for associative array, as key is a word, $ is required ([$i])!
Old answer for bash prior to V4.2
Unfortunately, bash give no way to make difference betwen empty and undefined variable.
But there is some ways:
$ array=()
$ array[12]="red"
$ array[51]="blac...
Last non-empty cell in a column
...ng this. Just curious, I found the exact same formulas and nearly the same wording over at exceljet.net/formula/get-value-of-last-non-empty-cell . Is that also you or someone else? There is no obvious connection.
– Solomon Rutzky
Oct 3 '16 at 22:21
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How do I ignore files in a directory in Git?
...ing description, but it would only find a match with a directory. In other words, foo/ will match a directory foo and paths underneath it, but will not match a regular file or a symbolic link foo (this is consistent with the way how pathspec works in general in git).
If the pattern does not contain ...
What in the world are Spring beans?
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An instance is merely another word for objects. When you use "object instances" aren't you saying object objects?
– Flame of udun
Oct 5 '18 at 15:50
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SQL Server - When to use Clustered vs non-Clustered Index?
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I just want to put in a word of warning: please very carefully pick your clustered index! Every "regular" data table ought to have a clustered index, since having a clustered index does indeed speed up a lot of operations - yes, speed up, even inser...
Can media queries resize based on a div element instead of the screen?
...s: calc( var(--multiplier) * 999 );
}
}
Demo
Heydon's article is 1000 words explaining it in detail, and I'd highly recommend reading it.
Is Python interpreted, or compiled, or both?
...t if not all implementations fall in one category, so one might save a few words saying the language is interpreted/compiled too, but it's still an important distinction, both because it aids understanding and because there are quite a few languages with usable implementations of both kinds (mostly ...
Write string to output stream
...rite a string to a stream, you must first convert it to bytes, or in other words encode it. You can do that manually (as you suggest) using the String.getBytes(Charset) method, but you should avoid the String.getBytes() method, because that uses the default encoding of the JVM, which can't be reliab...
AngularJS Multiple ng-app within a page
... to define the root element to auto-bootstrap as an application.
In other words, while it is technically possible to have several applications per page, only one ng-app directive will be automatically instantiated and initialized by the Angular framework.
...
When to use lambda, when to use Proc.new?
...yet, but I don't imagine they would change it all that much (don't take my word for it though, it seems you have heard of some changes, so I am probably wrong there).
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