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How to check if a file is a valid image file?
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A lot of times the first couple chars will be a magic number for various file formats. You could check for this in addition to your exception checking above.
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How do I check CPU and Memory Usage in Java?
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Just curious, why should these only be an estimate?
– ComputerScientist
May 24 '15 at 23:12
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NSDictionary - Need to check whether dictionary contains key-value pair or not
I just need to ask something as follow.
Suppose I am having a dictionary.
2 Answers
2
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Debugging in Clojure? [closed]
...trace, which allows you to look at the inputs and outputs of selected functions.
(use 'clojure.contrib.trace)
(defn fib[n] (if (< n 2) n (+ (fib (- n 1)) (fib (- n 2)))))
(dotrace [fib] (fib 3))
produces the output:
TRACE t4425: (fib 3)
TRACE t4426: | (fib 2)
TRACE t4427: | | (fib 1)...
Why and when to use Node.js? [duplicate]
...t to use Node.js if you want to write highly scaling and efficient applications using non-blocking I/O whilst still having a high level scripting language available. If needed, you can hand optimise parts of your code by writing extensions in C.
There are plenty of OS libraries for Node.js that wil...
Comparing strings by their alphabetical order
...g.String.compareTo). This feature is well documented on the java documentation site.
Here is a short program that demonstrates it:
class StringCompareExample {
public static void main(String args[]){
String s1 = "Project"; String s2 = "Sunject";
verboseCompare(s1, s2);
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How to parse Excel (XLS) file in Javascript/HTML5
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Below Function converts the Excel sheet (XLSX format) data to JSON. you can add promise to the function.
<script src="https://cdnjs.cloudflare.com/ajax/libs/xlsx/0.8.0/jszip.js"></script>
<script src="https://cdnjs.clou...
How to pass an object from one activity to another on Android
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One option could be letting your custom class implement the Serializable interface and then you can pass object instances in the intent extra using the putExtra(Serializable..) variant of the Intent#putExtra() method.
Pseudocode:
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How to make an HTTP request + basic auth in Swift
I have a RESTFull service with basic authentication and I want to invoke it from iOS+swift. How and where I must provide Credential for this request?
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Remove folder and its contents from git/GitHub's history
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I find that the --tree-filter option used in other answers can be very slow, especially on larger repositories with lots of commits.
Here is the method I use to completely remove a directory from the git history using the --index-filter option, which runs mu...