I need to check if the certain value exists in both arrays and if exists remove this element from the second array. I know that it exists.
taking the 1st element from array doubleTue, taking the index where is this value in amTue and pmTue then remove those by using splice command.
But now my code is having problem on getting the first value.
tried as in level array: var val = doubleTue[i]
and 2 level array: var val - doubleTue[i][0]
tried toString(), read()
for (var n=0; n<doubleTue.length; n++)
{
var val = doubleTue[i][0];
var val1 = amTue.indexOf(val);
if (val1!=-1) {amTue.splice(val1, 1);};
var val2=pmTue.indexOf(val);
if (val2!=-1) {pmTue.splice(val2, 1); };
}
}
the issue is found. i have used wrong variable for looping. hehe. copy past issue
thnks all
Related
Is there an easier approach to convert an Intellij IDEA environment variable into a list of Tuples?
My environment variable for Intellij is
GROCERY_LIST=[("egg", "dairy"),("chicken", "meat"),("apple", "fruit")]
The environment variable gets accessed into Kotlin file as String.
val g_list = System.getenv("GROCERY_LIST")
Ideally I'd like to iterate over g_list, first element being ("egg", "dairy") and so on.
And then ("egg", "dairy") is a tuple/pair
I have tried to split g_list by comma that's NOT inside quotes i.e
val splitted_list = g_list.split(",(?=(?:[^\\\"]*\\\"[^\\\"]*\\\")*[^\\\"]*\$)".toRegex()).toTypedArray()
this gives me first element as [("egg", second element as "dairy")] and so on.
Also created a data class and tried to map the string into data class using jacksonObjectMapper following this link:
val mapper = jacksonObjectMapper()
val g_list = System.getenv("GROCERY_LIST")
val myList: List<Shopping> = mapper.readValue(g_list)
data class Shopping(val a: String, val b: String)
You can create a regular expression to match all strings in your environmental variable.
Regex::findAll()
Then loop through the strings while creating a list of Shopping objects.
// Raw data set.
val groceryList: String = "[(\"egg\", \"dairy\"),(\"chicken\", \"meat\"),(\"apple\", \"fruit\")]"
// Build regular expression.
val regex = Regex("\"([\\s\\S]+?)\"")
val matchResult = regex.findAll(groceryList)
val iterator = matchResult.iterator()
// Create a List of `Shopping` objects.
var first: String = "";
var second: String = "";
val shoppingList = mutableListOf<Shopping>()
var i = 0;
while (iterator.hasNext()) {
val value = iterator.next().value;
if (i % 2 == 0) {
first = value;
} else {
second = value;
shoppingList.add(Shopping(first, second))
first = ""
second = ""
}
i++
}
// Print Shopping List.
for (s in shoppingList) {
println(s)
}
// Output.
/*
Shopping(a="egg", b="dairy")
Shopping(a="chicken", b="meat")
Shopping(a="apple", b="fruit")
*/
data class Shopping(val a: String, val b: String)
Never a good idea to use regex to match parenthesis.
I would suggest a step-by-step approach:
You could first match the name and the value by
(\w+)=(.*)
There you get the name in group 1 and the value in group 2 without caring about any subsequent = characters that might appear in the value.
If you then want to split the value, I would get rid of start and end parenthesis first by matching by
(?<=\[\().*(?=\)\])
(or simply cut off the first and last two characters of the string, if it is always given it starts with [( and ends in )])
Then get the single list entries from splitting by
\),\(
(take care that the split operation also takes a regex, so you have to escape it)
And for each list entry you could split that simply by
,\s*
or, if you want the quote character to be removed, use a match with
\"(.*)\",\s*\"(.*)\"
where group 1 contains the key (left of equals sign) and group 2 the value (right of equals sign)
I was using the removeAt function and it was just working fine but then suddenly the compiler started to throw the error unresolved reference : removeAt
Here is the code:
fun main() {
val nums = mutableListOf(-3, 167, 0, 9, 212, 3, 5, 665, 5, 8) // this is just a list
var newList = nums.sorted() // this is the sorted list
var finall = mutableListOf<Int>() // this is an empty list that will contain all the removed elements
for(i in 1..3) {
var min: Int = newList.removeAt(0) // element removed from newList is saved from min variable
// above line is producing the error
finall.add(min) // then the min variable is added to the empty list created before
}
println(finall)
println(newList)
}
I have studied a bunch of documentries but I'm unable to find my mistake
The 3rd line, where you sort the list, returns a list not a mutableList. So newList is non-mutable. Replacing that 3rd line with var newList = nums.sorted().toMutableList() will make newList mutable and solve your problem.
The result of nums.sorted() is an immutable list, which means you cannot change it, or in other words, remove elements.
You need to tell kotlin you want a mutable list var newList = nums.sorted().toMutableList()
because newList is List object. List object no method removeAt
you need using newList.toMutableList().removeAt()
I know this question has been asked a bunch of times, but none of the answers (or at least what i took away from them) was a help to my particiular problem.
I want to dynamically change a part of the variable path, so i don't have to repeat the same code x-times with just two characters changing.
Here's what i got:
In the beginning of my script, i'm setting the reference to PlayerData scripts, attached to the GameManager object like this:
var P1 : P1_Data;
var P2 : P2_Data;
function Start(){
P1 = GameObject.Find("GameManager").GetComponent.<P1_Data>();
P2 = GameObject.Find("GameManager").GetComponent.<P2_Data>();
}
Later, i want to access these scripts using the currentPlayer variable to dynamically adjust the path:
var currentPlayer : String = "P1"; //this actually happens along with some other stuff in the SwitchPlayers function, i just put it here for better understanding
if (currentPlayer.PlayerEnergy >= value){
// do stuff
}
As i was afraid, i got an error saying, that PlayerEnergy was not a part of UnityEngine.String.
So how do I get unity to read "currentPlayer" as part of the variable path?
Maybe some parse function I haven't found?
Or am I going down an entirely wrong road here?
Cheers
PS: I also tried putting the P1 and P2 variables into an array and access them like this:
if (PlayerData[CurrentPlayerInt].PlayerEnergy >= value){
// do stuff
}
to no success.
First of all,
var currentPlayer : String = "P1"
here P1 is just string, not the previous P1/P2 which are referenced to two scripts. So, if you want, you can change
currentPlayer.PlayerEnergy >= value
to
P1.PlayerEnergy >= value
or,
P2.PlayerEnergy >= value
But if you just want one function for them, like
currentPlayer.PlayerEnergy >= value
Then you have to first set currentPlayer to P1/P2 which I assume you are trying to do. You must have some codes that can verify which player is selected. Then, maybe this can help -
var playerSelected: int = 0;
var currentPlayerEnergy: int = 0;
.....
//Use your codes to verify which player is selected and then,
if (playerSelected == 1) {
currentPlayerEnergy = P1.PlayerEnergy;
} else if (playerSelected == 2) {
currentPlayerEnergy = P2.PlayerEnergy;
}
//Now use your favorite function
if (currentPlayerEnergy >= value) {
//Do stuff
}
As there was no reply providing the answer I needed, I'll share the solution that did the trick for me, provided by a fellow student.
Instead of having the PlayerData scripts pre-written, I generate them using a public class function in a Playermanager script. This generates the Playerdata as attached scripts, saved into an array.
I can then access them through Playermanager.Playerlist[Playernumber].targetvariable.
Which is what I wanted to do, only with the Playerdata being attached to a script instead of a gameobject. And it works great!
Here's the full code of my Playermanager Script:
//initialise max players
public var maxplayers : int = 2;
// Initialise Playerlist
static var Players = new List.<PlayerData>();
function Start () {
for (var i : int = 0; i < maxplayers; i++){
var Player = new PlayerData();
Players.Add(Player);
Players[i].PlayerName = "Player " + i;
}
DontDestroyOnLoad (transform.gameObject);
}
public class PlayerData {
public var PlayerName : String;
public var PlayerEnergy : int = 15;
public var Fleet : List.<GameObject> = new List.<GameObject>();
}
As you see, you can put any type of variable in this class.
I hope this helps some of you who have the same problem.
cheers,
Tux
In Java, and many other languages, one can grab a subsection of a string by saying something like String.substring(begin, end). My question is, Does there exist a built-in capability to do the same with Lists in Java that returns a sublist from the original?
This method is called subList and exists for both array and linked lists. Beware that the list it returns is backed by the existing list so updating the original one will update the slice.
The answer can be found in the List API: List#subList(int, int) (can't figure out how to get the link working....)
Be warned, though, that this is a view of the underlying list, so if you change the original list, you'll change the sublist, and the semantics of the sublist is undefined if you structurally modify the original list. So I suppose it isn't strictly what you're looking for...
If you want a structurally independent subsection of the list, I believe you'll have to do something like:
ArrayList<something> copy = new ArrayList<>(oldList.subsection(begin, end));
However, this will retain references to the original objects in the sublist. You'll probably have to manually clone everything if you want a completely new list.
The method is called sublist and can be found here in the javadocs
http://docs.oracle.com/javase/7/docs/api/java/util/ArrayList.html#subList(int, int)
You can use subList(start, end)
ArrayList<String> arrl = new ArrayList<String>();
//adding elements to the end
arrl.add("First");
arrl.add("Second");
arrl.add("Third");
arrl.add("Random");
arrl.add("Click");
System.out.println("Actual ArrayList:"+arrl);
List<String> list = arrl.subList(2, 4);
System.out.println("Sub List: "+list);
Ouput :
Actual ArrayList:[First, Second, Third, Random, Click]
Sub List: [Third, Random]
You might just want to make a new method if you want it to be exactly like substring is to String.
public static List<String> sub(List<String> strs, int start, int end) {
List<String> ret = new ArrayList<>(); //Make a new empty ArrayList with String values
for (int i = start; i < end; i++) { //From start inclusive to end exclusive
ret.add(strs.get(i)); //Append the value of strs at the current index to the end of ret
}
return ret;
}
public static List<String> sub(List<String> strs, int start) {
List<String> ret = new ArrayList<>(); //Make a new empty ArrayList with String values
for (int i = start; i < strs.size(); i++) { //From start inclusive to the end of strs
ret.add(strs.get(i)); //Append the value of strs at the current index to the end of ret
}
return ret;
}
If myStrings is an ArrayList of the following Strings: {"do","you","really","think","I","am","addicted","to","coding"}, then sub(myStrings,1,6) would return {"you", "really", "think", "I", "am"} and sub(myStrings,4) would return {"I", "am", "addicted", "to", "coding"}. Also by doing sub(myStrings, 0) it would rewrite myStrings as a new ArrayList which could help with referencing problems.
I'm using node js 0.10.12 to perform querys to postgreSQL 9.1.
I get the error error invalid input synatx for integer: "{39}" (39 is an example number) when I try to perform an update query
I cannot see what is going wrong. Any advise?
Here is my code (snippets) in the front-end
//this is global
var gid=0;
//set websockets to search - works fine
var sd = new WebSocket("ws://localhost:0000");
sd.onmessage = function (evt)
{
//get data, parse it, because there is more than one vars, pass id to gid
var received_msg = evt.data;
var packet = JSON.parse(received_msg);
var tid = packet['tid'];
gid=tid;
}
//when user clicks button, set websockets to send id and other data, to perform update query
var sa = new WebSocket("ws://localhost:0000");
sa.onopen = function(){
sa.send(JSON.stringify({
command:'typesave',
indi:gid,
name:document.getElementById("typename").value,
}));
sa.onmessage = function (evt) {
alert("Saved");
sa.close;
gid=0;//make gid 0 again, for re-use
}
And the back -end (query)
var query=client.query("UPDATE type SET t_name=$1,t_color=$2 WHERE t_id = $3 ",[name, color, indi])
query.on("row", function (row, result) {
result.addRow(row);
});
query.on("end", function (result) {
connection.send("o");
client.end();
});
Why this not work and the number does not get recognized?
Thanks in advance
As one would expect from the initial problem, your database driver is sending in an integer array of one member into a field for an integer. PostgreSQL rightly rejects the data and return an error. '{39}' in PostgreSQL terms is exactly equivalent to ARRAY[39] using an array constructor and [39] in JSON.
Now, obviously you can just change your query call to pull the first item out of the JSON array. and send that instead of the whole array, but I would be worried about what happens if things change and you get multiple values. You may want to look at separating that logic out for this data structure.