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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 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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When to choose checked and unchecked exceptions
... in an unchecked exception. If you follow this rule you will find yourself converting checked exceptions to unchecked exceptions and vice versa depending on what layer you are in.
For both checked and unchecked exceptions, use the right abstraction level. For example, a code repository with two dif...
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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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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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...
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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How to convert timestamps to dates in Bash?
I need a shell command or script that converts a Unix timestamp to a date. The input can come either from the first parameter or from stdin, allowing for the following usage patterns:
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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'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...