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Difference between as.POSIXct/as.POSIXlt and strptime for converting character vectors to POSIXct/PO
I have followed a number of questions here that asks about how to convert character vectors to datetime classes. I often see 2 methods, the strptime and the as.POSIXct/as.POSIXlt methods. I looked at the 2 functions but am unclear what the difference is.
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How can I convert a DOM element to a jQuery element?
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var elm = document.createElement("div");
var jelm = $(elm);//convert to jQuery Element
var htmlElm = jelm[0];//convert to HTML Element
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Parse date without timezone javascript
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The date is parsed correctly, it's just toString that converts it to your local timezone:
let s = "2005-07-08T11:22:33+0000";
let d = new Date(Date.parse(s));
// this logs for me
// "Fri Jul 08 2005 13:22:33 GMT+0200 (Central European Summer Time)"
// and something ...
How to convert a DOM node list to an array in Javascript?
...rom(nodeList)
But thinking about it, I guess the most common use case to convert a NodeList to an Array is to iterate over it, and now the NodeList.prototype object has the forEach method natively, so if you are on a modern environment you can use it directly, or have a pollyfill.
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What's wrong with cplusplus.com?
...while using the function.
cplusplus.com Return section states "...If the converted value would be out of the range of representable values by an int, it causes undefined behavior."
This is correct, as per the standard "If the numeric value of the string can't be represented in int, then the behav...
AES Encryption for an NSString on the iPhone
... Encrypt to NSData, and use one of the many Base64 encoders to convert that to a string. There is no way to encrypt from a string to a string without a data-to-string encoder.
– Rob Napier
Oct 7 '12 at 17:40
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How do you convert Html to plain text?
...ee and open source HtmlAgilityPack has in one of its samples a method that converts from HTML to plain text.
var plainText = HtmlUtilities.ConvertToPlainText(string html);
Feed it an HTML string like
<b>hello, <i>world!</i></b>
And you'll get a plain text result like:
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How to convert java.sql.timestamp to LocalDate (java8) java.time?
In Java 8, how can I convert a Timestamp (in java.sql ) to a LocalDate (in java.time )?
3 Answers
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Convert a row of a data frame to vector
... you extract a single row from a data frame you get a one-row data frame. Convert it to a numeric vector:
as.numeric(df[1,])
As @Roland suggests, unlist(df[1,]) will convert the one-row data frame to a numeric vector without dropping the names. Therefore unname(unlist(df[1,])) is another, sl...
What is the difference between string primitives and String objects in JavaScript?
...ame is called auto-boxing. So what actually happens is that a primitive is converted to its wrapper type when a method of the wrapper type is invoked. Put simple:
var s = 'test';
Is a primitive data type. It has no methods, it is nothing more than a pointer to a raw data memory reference, which e...