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Correct way to use StringBuilder in SQL
... Will that take memory equal to using String like below?
No, it'll cause more memory churn than just the straight concat you quoted. (Until/unless the JVM optimizer sees that the explicit StringBuilder in the code is unnecessary and optimizes it out, if it can.)
If the author of that code wants t...
Speed up the loop operation in R
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Ah, I should have thought through it more carefully. Thanks for showing me the mistake.
– Gregor Thomas
May 25 '16 at 23:07
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What does 'var that = this;' mean in JavaScript?
...ecially if the functions are longer than a couple of lines. I always use a more descriptive alias. In my examples above, I'd probably use clickedEl.
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String concatenation: concat() vs “+” operator
...ion but a+=b will treat the original value of a as if it were null. Furthermore, the concat() method only accepts String values while the + operator will silently convert the argument to a String (using the toString() method for objects). So the concat() method is more strict in what it accepts.
To...
Clojure: reduce vs. apply
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+ is itself implemented in terms of reduce for the variable-arity case (more than 2 arguments). Indeed, this seems like an immensely sensible "default" way to go for any variable-arity, associative function: reduce has the potential to perform some optimisations to speed things up -- perhaps thro...
Shell command to sum integers, one per line?
... going to be adding anything exceeding 2^31 (2147483647). See comments for more background. One suggestion is to use printf rather than print:
awk '{s+=$1} END {printf "%.0f", s}' mydatafile
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What is the difference between the HashMap and Map objects in Java?
...ap<String, Object> things;
private HashMap<String, Object> moreThings;
protected HashMap<String, Object> getThings() {
return this.things;
}
protected HashMap<String, Object> getMoreThings() {
return this.moreThings;
}
public Foo() {...
When to use thread pool in C#? [closed]
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How do I iterate over a range of numbers defined by variables in Bash?
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502
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Gson: How to exclude specific fields from Serialization without annotations
...ed json give it a transient keyword, eg:
private transient String name;
More details in the Gson documentation
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