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Why can I add named properties to an array as if it were an object?

The following two different code snippets seem equivalent to me: 7 Answers 7 ...
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Is it possible to center text in select box?

... I'm afraid this isn't possible with plain CSS, and won't be possible to make completely cross-browser compatible. However, using a jQuery plugin, you could style the dropdown: https://www.filamentgroup.com/lab/jquery-ui-selectmenu-an-aria-accessible-plugin-for-s...
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Replacing Pandas or Numpy Nan with a None to use with MysqlDB

I am trying to write a Pandas dataframe (or can use a numpy array) to a mysql database using MysqlDB . MysqlDB doesn't seem understand 'nan' and my database throws out an error saying nan is not in the field list. I need to find a way to convert the 'nan' into a NoneType. ...
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String formatting: % vs. .format vs. string literal

Python 2.6 introduced the str.format() method with a slightly different syntax from the existing % operator. Which is better and for what situations? ...
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Rails: FATAL - Peer authentication failed for user (PG::Error)

I am running my development on Ubuntu 11.10, and RubyMine 8 Answers 8 ...
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Generic deep diff between two objects

... I wrote a little class that is doing what you want, you can test it here. Only thing that is different from your proposal is that I don't consider [1,[{c: 1},2,3],{a:'hey'}] and [{a:'hey'},1,[3,{c: 1},2]] to be same, because I think that arrays are not eq...
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How do I create a Bash alias?

I'm on OSX and I need to put something like this, alias blah="/usr/bin/blah" in a config file but I don't know where the config file is. ...
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Conditional ng-include in angularjs

How can I do the ng-include conditionally in angularJS? 5 Answers 5 ...
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Regular expression to get a string between two strings in Javascript

... A lookahead (that (?= part) does not consume any input. It is a zero-width assertion (as are boundary checks and lookbehinds). You want a regular match here, to consume the cow portion. To capture the portion in between, you use a capturing group (just put the portion of p...
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How to calculate the number of days between two dates? [duplicate]

... const oneDay = 24 * 60 * 60 * 1000; // hours*minutes*seconds*milliseconds const firstDate = new Date(2008, 1, 12); const secondDate = new Date(2008, 1, 22); const diffDays = Math.round(Math.abs((firstDate - secondDate) / oneDay)); ...