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Querying DynamoDB by date
I'm coming from a relational database background and trying to work with amazon's DynamoDB
7 Answers
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JavaScript string encryption and decryption?
...tps://cdnjs.cloudflare.com/ajax/libs/crypto-js/3.1.2/rollups/aes.js" integrity="sha256-/H4YS+7aYb9kJ5OKhFYPUjSJdrtV6AeyJOtTkw6X72o=" crossorigin="anonymous"></script>
<br><br>
<label>encrypted</label>
<div id="demo1"></div>
<br>
<label&g...
Finding all objects that have a given property inside a collection [duplicate]
...icated object, such as a Cat, which has many properties, such as age, favorite cat food, and so forth.
20 Answers
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MySQL, better to insert NULL or empty string?
I have a form on a website which has a lot of different fields. Some of the fields are optional while some are mandatory. In my DB I have a table which holds all these values, is it better practice to insert a NULL value or an empty string into the DB columns where the user didn't put any data?
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Java SafeVarargs annotation, does a standard or best practice exist?
... examples on the Internet and on StackOverflow about the particular issue with generics and varargs. Basically, it's when you have a variable number of arguments of a type-parameter type:
<T> void foo(T... args);
In Java, varargs are a syntactic sugar that undergoes a simple "re-writing" at...
Checking if a string array contains a value, and if so, getting its position
... // the array contains the string and the pos variable
// will have its position in the array
}
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JavaScript code to stop form submission
... the function to prevent the form submission
<form name="myForm" onsubmit="return validateMyForm();">
and function like
<script type="text/javascript">
function validateMyForm()
{
if(check if your conditions are not satisfying)
{
alert("validation failed false");
return...
What is the rationale for all comparisons returning false for IEEE754 NaN values?
...values behave differently from all other values?
That is, all comparisons with the operators ==, =, where one or both values is NaN returns false, contrary to the behaviour of all other values.
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Is the creation of Java class files deterministic?
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Let's put it this way:
I can easily produce an entirely conforming Java compiler that never produces the same .class file twice, given the same .java file.
I could do this by tweaking all kinds of bytecode construction or by simply a...
Set environment variables on Mac OS X Lion
When someone says "edit your .plist file" or "your .profile" or ".bash_profile" etc, this just confuses me. I have no idea where these files are, how to create them if I have to do that, etc, and also why there seem to be so many different ones (why? Do they do different things?)
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