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Why is [1,2] + [3,4] = “1,23,4” in JavaScript?
...n and consequently my answer is getting a lot of attention I felt it would be useful and relevant to have an overview about how the + operator behaves in general also.
So, here it goes.
Excluding E4X and implementation-specific stuff, Javascript (as of ES5) has 6 built-in data types:
Undefined
Null...
MySQL LIKE IN()?
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A REGEXP might be more efficient, but you'd have to benchmark it to be sure, e.g.
SELECT * from fiberbox where field REGEXP '1740|1938|1940';
share
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How to loop over directories in Linux?
I am writing a script in bash on Linux and need to go through all subdirectory names in a given directory. How can I loop through these directories (and skip regular files)?
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What is the difference between localStorage, sessionStorage, session and cookies?
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This is an extremely broad scope question, and a lot of the pros/cons will be contextual to the situation.
In all cases, these storage mechanisms will be specific to an individual browser on an individual computer/device. Any requirement to stor...
How do I kill all the processes in Mysql “show processlist”?
Because I see a lot of processes there, and the "time" column shows big values for all of them.
23 Answers
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How to rename with prefix/suffix?
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In Bash and zsh you can do this with Brace Expansion. This simply expands a list of items in braces. For example:
# echo {vanilla,chocolate,strawberry}-ice-cream
vanilla-ice-cream chocolate-ice-cream strawberry-ice-cream
So...
What is the difference between parseInt(string) and Number(string) in JavaScript? [duplicate]
What is the difference between parseInt(string) and Number(string) in JavaScript?
6 Answers
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Show constraints on tables command
I have tables that I've tried setting PK FK relationships on but I want to verify this. How can I show the PK/FK restraints? I saw this manual page, but it does not show examples and my google search was fruitless also. My database is credentialing1 and my constrained tables are practices and ...
adding multiple entries to a HashMap at once in one statement
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You can use the Double Brace Initialization as shown below:
Map<String, Integer> hashMap = new HashMap<String, Integer>()
{{
put("One", 1);
put("Two", 2);
put("Three", 3);
}};
As a piece of warning, please refer to t...
how to delete all cookies of my website in php
I'm wondering if I can delete all my website's cookies when a user click on logout, because I used this as function to delete cookies but it isn't work properly:
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