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Best practices/performance: mixing StringBuilder.append with String.concat
....toString();
concat()
String s = s1.concat(s2);
String creates char[] array that can fit both s1 and s2. Copies s1 and s2 contents to this new array. Actually requires less work then + operator.
StringBuilder.append()
Maintains an internal char[] array that grows when needed. No extra char[] ...
Getting JavaScript object key list
...e, as it means you're implicitly typing the object. Assigning [] to it (or array() back then) makes it an array, which you can then use as an array safely.
– Niels Keurentjes
Nov 29 '14 at 23:28
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Why does [5,6,8,7][1,2] = 8 in JavaScript?
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[1,2,3,4,5,6][1,2,3];
^ ^
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array + — array subscript access operation,
where index is `1,2,3`,
which is an expression that evaluates to `3`.
The second [...] cannot be an array, so it’s an array subsc...
Difference between class and type
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A class is a type. An interface is a type. A primitive is a type. An array is a type.
Therefore, every type is also either a class (including an enum constant), an interface, a primitive, or an array.
There are two distinct categories of types: primitive types and reference types:
A variab...
Reading a string with scanf
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An array "decays" into a pointer to its first element, so scanf("%s", string) is equivalent to scanf("%s", &string[0]). On the other hand, scanf("%s", &string) passes a pointer-to-char[256], but it points to the same pla...
How do you convert a byte array to a hexadecimal string, and vice versa?
How can you convert a byte array to a hexadecimal string, and vice versa?
45 Answers
4...
Remove json element
...n.foo from the dictionary.
You can use splice to remove elements from an array.
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How to get indices of a sorted array in Python
...n available:
>>> import numpy
>>> numpy.argsort(myList)
array([0, 1, 2, 4, 3])
http://docs.scipy.org/doc/numpy/reference/generated/numpy.argsort.html
This returns the arguments that would sort the array or list.
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Null check in an enhanced for loop
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Use ArrayUtils.nullToEmpty from the commons-lang library for Arrays
for( Object o : ArrayUtils.nullToEmpty(list) ) {
// do whatever
}
This functionality exists in the commons-lang library, which is included in most Java pr...
Listing all permutations of a string/integer
... Main()
{
string str = "sagiv";
char[] arr = str.ToCharArray();
GetPer(arr);
}
}
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