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What is the relative performance difference of if/else versus switch statement in Java?
... First create some interface:
public interface Action {
void execute(String input);
}
And get hold of all implementations in some Map. You can do this either statically or dynamically:
Map<String, Action> actions = new HashMap<String, Action>();
Finally replace the if/else or ...
Compare integer in bash, unary operator expected
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Judging from the error message the value of i was the empty string when you executed it, not 0.
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How do you use an identity file with rsync?
...ight make a difference. Try replacing ~ with $HOME. Try double-quoting the string for the -e option.
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What's a standard way to do a no-op in python?
...n existing code idiom like a comprehension, or a lambda, or (god forbid) a string to be passed into eval(…) (which q.v. docs.python.org/3/library/functions.html#eval if you must).
– fish2000
Apr 23 '18 at 23:26
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Are static fields open for garbage collection?
....e. static stuff) will almost never be garbage collected. The exception is String pool.
So before you suddenly decide to do
private static MyGiantClass myGiantObject = new MyGiantClass()
Think twice as I have learnt the hard way.
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Replace words in the body text
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To replace a string in your HTML with another use the replace method on innerHTML:
document.body.innerHTML = document.body.innerHTML.replace('hello', 'hi');
Note that this will replace the first instance of hello throughout the body, i...
How to change color in markdown cells ipython/jupyter notebook?
I'm only looking to format a specific string within a cell. I change that cell's format to "Markdown" but I'm not sure how to change text color of a single word.
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Regular Expression to match only alphabetic characters
I was wondering If I could get a regular expression which will match a string that only has alphabetic characters, and that alone.
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Use of “instanceof” in Java [duplicate]
...ied type.
Example :
public class MainClass {
public static void main(String[] a) {
String s = "Hello";
int i = 0;
String g;
if (s instanceof java.lang.String) {
// This is going to be printed
System.out.println("s is a String");
}
if (i instanceof Integer...
Check if a Bash array contains a value
... loop over all the elements (at least not explicitly). But since array_to_string_internal() in array.c still loops over array elements and concatenates them into a string, it's probably not more efficient than the looping solutions proposed, but it's more readable.
if [[ " ${array[@]} " =~ " ${val...