大约有 10,100 项符合查询结果（耗时：0.0232秒） [XML]
Serializing object that contains cyclic object value
...))
return null;
let s = stack.concat([obj]);
return Array.isArray(obj)
? obj.map(x => decycle(x, s))
: Object.fromEntries(
Object.entries(obj)
.map(([k, v]) => [k, decycle(v, s)]));
}
//
let a = {b: [1, 2, 3]}
a.b.p...
How to delete duplicate lines in a file without sorting it in Unix?
...
awk '!seen[$0]++' file.txt
seen is an associative-array that Awk will pass every line of the file to. If a line isn't in the array then seen[$0] will evaluate to false. The ! is the logical NOT operator and will invert the false to true. Awk will print the lines where the ex...
Join strings with a delimiter only if strings are not null or empty
...s great, but it doesn't work in older browsers like IE8 due to the lack of Array.prototype.filter() in their JavaScript engines.
For those who are interested in an efficient solution working in a wide range of browsers (including IE 5.5 - 8) and which doesn't require jQuery, see below:
var join = ...
How to get IP address of the device from code?
....util.InetAddressUtils;
public class Utils {
/**
* Convert byte array to hex string
* @param bytes toConvert
* @return hexValue
*/
public static String bytesToHex(byte[] bytes) {
StringBuilder sbuf = new StringBuilder();
for(int idx=0; idx < bytes.len...
Regarding 'main(int argc, char *argv[])' [duplicate]
... of command line arguments given to the program at runtime, and argv is an array of arrays of characters (rather, an array of C-strings) containing these arguments. If you know you're not going to need the command line arguments, you can declare your main at taking a void argument, instead:
int mai...
What are good examples of genetic algorithms/genetic programming solutions? [closed]
...tours.
Update: Because a couple people have asked how ...
Start with an array of guests (or cities) in some arbitrary but consistent ordering, e.g., alphabetized. Call this the reference solution. Think of a guest's index as his/her seat number.
Instead of trying to encode this ordering direct...
Rails: fields_for with index?
... end
else
record_object = record_name.is_a?(Array) ? record_name.last : record_name
record_name = ActiveModel::Naming.param_key(record_object)
end
index = if options.has_key?(:index)
options[:index]
elsif...
Expansion of variables inside single quotes in a command in Bash
...un a command from the shell, what that command receives as arguments is an array of null-terminated strings. Those strings may contain absolutely any non-null character.
But when the shell is building that array of strings from a command line, it interprets some characters specially; this is design...
Sorting an ArrayList of objects using a custom sorting order
..., I would recommend to read it anyway.
There are various way to sort an ArrayList. If you want to define a natural (default) ordering, then you need to let Contact implement Comparable. Assuming that you want to sort by default on name, then do (nullchecks omitted for simplicity):
public class C...
How to extract a string using JavaScript Regex?
...nt the matching group (what's
inside the parenthesis) rather than
the full array? arr[0] is
the full match ("\nSUMMARY:...") and
the next indexes contain the group
matches.
String.match(regexp) is
supposed to return an array with the
matches. In my browser it doesn't (Safari on Mac returns only the ...