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Best practice to validate null and empty collection in Java
... then you can use CollectionUtils to check against both Collections (List, Array) and Map etc.
if(CollectionUtils.isEmpty(...)) {...}
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Split a String into an array in Swift?
.../ 2017
Xcode 8.1 / Swift 3.0.1
Here is the way multiple delimiters with array.
import Foundation
let mathString: String = "12-37*2/5"
let numbers = mathString.components(separatedBy: ["-", "*", "/"])
print(numbers)
Output:
["12", "37", "2", "5"]
...
URL rewriting with PHP
... // No path elements means home
ShowHomepage();
} else switch(array_shift($elements)) // Pop off first item and switch
{
case 'Some-text-goes-here':
ShowPicture($elements); // passes rest of parameters to internal function
break;
case 'more':
...
Why does struct alignment depend on whether a field type is primitive or user-defined?
...000007fe039d3b78
EEClass: 000007fe039d3ad0
Size: 40(0x28) bytes
Array: Rank 1, Number of elements 1, Type VALUETYPE
Fields:
None
We see that this is a ValueType and its the one we created. Since this is an array we need to get the ValueType def of a single element in the array:
...
How do you access the matched groups in a JavaScript regular expression?
...rge strings. But if you need, the result can be easily transformed into an Array by using the spread syntax or the Array.from method:
function getFirstGroup(regexp, str) {
const array = [...str.matchAll(regexp)];
return array.map(m => m[1]);
}
// or:
function getFirstGroup(regexp, str) {
...
Reading a delimited string into an array in Bash
...
In order to convert a string into an array, please use
arr=($line)
or
read -a arr <<< $line
It is crucial not to use quotes since this does the trick.
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Given a class, see if instance has method (Ruby)
... because instance_methods changed between Ruby 1.8 and 1.9. 1.8 returns an array of strings and 1.9 returns an array of symbols. method_defined? takes a symbol in both 1.8 and 1.9.
– Jason
May 2 '12 at 17:03
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What exactly does the .join() method do?
...ist ["5", "9", "5"].
It appears that you're looking for + instead:
print array.array('c', random.sample(string.ascii_letters, 20 - len(strid)))
.tostring() + strid
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What's the difference between '$(this)' and 'this'?
...h the current element. This element comes from the jQuery object's element array. Each jQuery object constructed contains an array of elements which match the selectorjQuery API that was used to instantiate the jQuery object.
$(selector) calls the jQuery function (remember that $ is a reference to...
JavaScript isset() equivalent
In PHP you can do if(isset($array['foo'])) { ... } . In JavaScript you often use if(array.foo) { ... } to do the same, but this is not exactly the same statement. The condition will also evaluate to false if array.foo does exists but is false or 0 (and probably other values as well).
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