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Why exactly is eval evil?
...estion is not specific to LISP. Here is an answer on the same question for PHP, and it applies to LISP, Ruby, and other other language that has an eval:
The main problems with eval() are:
Potential unsafe input. Passing an untrusted parameter is a way to
fail. It is often not a trivial...
What is the meaning of erb?
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lame, they should remove the html. u don't see html.php
– luckyguy73
Oct 22 '16 at 23:26
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Is Using .NET 4.0 Tuples in my C# Code a Poor Design Decision?
...group of types that share a similar structure, and treating them simply as ordered set of values. In all cases, a benefit of tuples is that they avoid cluttering your namespace with data-only classes that expose properties but not methods.
Here's an example of a reasonable use for Tuple<>:
v...
How to get the contents of a webpage in a shell variable?
... This is a really neat trick. I invoke a shell script via a php script on a proxy server. When asked, the proxy server turns on expensive servers which shut themselves off after 2 hours. I need the output from wget for standard output to feed back to the Jenkins console record.
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How to check whether an object has certain method/property?
...much any modern dynamic scripting language (Python, Javascript, VB script, PHP, Lua... I could go on and on). It's not a bug, it's a feature.
– Tim Keating
Dec 3 '11 at 14:36
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How to get a Fragment to remove itself, i.e. its equivalent of finish()?
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What I don't understand is what to do in Df when 'OK' is pressed in order to remove fragments Df, Cf, and Bf?
Step #1: Have Df tell D "yo! we got the OK click!" via calling a method, either on the activity itself, or on an interface instance supplied by the activity.
Step #2: Have D remove...
How can I get form data with JavaScript/jQuery?
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Please also beware that in order to record a value from any form input, the input must have a name attribute.
– Chris - Jr
Oct 27 '17 at 19:37
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How to index into a dictionary?
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Dictionaries are unordered in Python versions up to and including Python 3.6. If you do not care about the order of the entries and want to access the keys or values by index anyway, you can use d.keys()[i] and d.values()[i] or d.items()[i]. ...
Setting unique Constraint with fluent API?
...t type unique key combination:
[Index("IX_UniqueKeyInt", IsUnique = true, Order = 1)]
public int UniqueKeyIntPart1 { get; set; }
[Index("IX_UniqueKeyInt", IsUnique = true, Order = 2)]
public int UniqueKeyIntPart2 { get; set; }
If the data type is string, then MaxLength attribute must be added:
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Jackson enum Serializing and DeSerializer
...hey're returning data that already includes a user friendly string. But in order to turn the rendered form back into an identifier, we need some code that can reverse the transformation. The hacky accepted answer wants to use a map to handle the transformation, but requires more maintenance. With th...