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Recursive copy undefined function


Recursive copy undefined function

By : user2954169
Date : November 22 2020, 01:01 AM
wish help you to fix your issue I have a recursive copy function that should copy all files from a directory to another, but it gives an error. This is the function; , Are you using any class? then you should use:
code :
$this->cpy(...)


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Why does this recursive copy function copy all files into every directory above the correct one?

Why does this recursive copy function copy all files into every directory above the correct one?


By : seyrankal
Date : March 29 2020, 07:55 AM
I hope this helps you . I write a function to copy files from directory A to directory B recursive. The code is like this: , You can easily diagnose this by putting
code :
    print path, dirs, files
for path, dirs, files in os.walk(src, topdown=True):
>>> copy_file("c:\Intel", "c:\Intel-Bak")
c:\Intel ['ExtremeGraphics', 'Logs'] []
c:\Intel\ExtremeGraphics ['CUI'] []
c:\Intel\ExtremeGraphics\CUI ['Resource'] []
c:\Intel\ExtremeGraphics\CUI\Resource [] ['Intel\xae Graphics and Media Control Panel.lnk', 'Intel\xae HD Graphics.lnk']
c:\Intel\ExtremeGraphics\CUI\Resource [] ['Intel\xae Graphics and Media Control Panel.lnk', 'Intel\xae HD Graphics.lnk']
c:\Intel\ExtremeGraphics\CUI ['Resource'] []
c:\Intel\ExtremeGraphics\CUI\Resource [] ['Intel\xae Graphics and Media Control Panel.lnk', 'Intel\xae HD Graphics.lnk']
c:\Intel\ExtremeGraphics\CUI\Resource [] ['Intel\xae Graphics and Media Control Panel.lnk', 'Intel\xae HD Graphics.lnk']
c:\Intel\Logs [] ['IntelChipset.log', 'IntelControlCenter.log', 'IntelGFX.log', 'IntelGFXCoin.log']
c:\Intel\ExtremeGraphics ['CUI'] []
c:\Intel\ExtremeGraphics\CUI ['Resource'] []
c:\Intel\ExtremeGraphics\CUI\Resource [] ['Intel\xae Graphics and Media Control Panel.lnk', 'Intel\xae HD Graphics.lnk']
c:\Intel\ExtremeGraphics\CUI\Resource [] ['Intel\xae Graphics and Media Control Panel.lnk', 'Intel\xae HD Graphics.lnk']
c:\Intel\ExtremeGraphics\CUI ['Resource'] []
c:\Intel\ExtremeGraphics\CUI\Resource [] ['Intel\xae Graphics and Media Control Panel.lnk', 'Intel\xae HD Graphics.lnk']
c:\Intel\ExtremeGraphics\CUI\Resource [] ['Intel\xae Graphics and Media Control Panel.lnk', 'Intel\xae HD Graphics.lnk']
c:\Intel\Logs [] ['IntelChipset.log', 'IntelControlCenter.log', 'IntelGFX.log', 'IntelGFXCoin.log']
visited = []
def copy_file(src, dest):
    for path, dirs, files in os.walk(src, topdown=True):
        if path not in visited:
            for di in dirs:
                print dest, di
                copy_file(join(path, di), join(dest,  di))
            if not exists(dest):
                os.makedirs(dest)
            for fi in files:
                shutil.copy(join(path, fi), dest)
            visited.append(path)
F# - Recursive function to copy a list

F# - Recursive function to copy a list


By : user3791240
Date : March 29 2020, 07:55 AM
I wish this help you Performing a lookup into the list (as well as getting the length of the list) is not very efficient, because the library needs to iterate over the entire list (or over the first N elements). For this reason, doing this is not really idiomatic in F#.
You can still keep most of the structure of your code, but change it a little like this:
code :
let copy input =
  let rec copy acc input =
    match input with
    | [] -> List.rev acc
    | x::xs -> copy (x::acc) xs
  copy [] input
Why does this recursive function return undefined?

Why does this recursive function return undefined?


By : Fraanclin Pedro
Date : March 29 2020, 07:55 AM
should help you out Explanation
The problem is that you don't return the recursive call's result, thus it is undefined when the whole call to merge is resolved.
code :
var str3 = "";
function merge(str1, str2) {
    if(str1.length == 0 || str2.length == 0) {
        console.log(str3);
        return str3;
    } else {
        str3 = str3 + str1.substring(0, 1) + str2.substring(0, 1);
        return merge(str1.substring(1, str1.length), str2.substring(1, str2.length)); //we return the recursive call
    }
}

var mergedString = merge("AAA","BBB"); //mergedString is "ABABAB"
Trying to understand why function is returning undefined in recursive function

Trying to understand why function is returning undefined in recursive function


By : Mr.Moda
Date : March 29 2020, 07:55 AM
this will help if num is not 10, you just call f again. The value returned from f is not allocated anywhere. You should return that value.
code :
function f(num){
  if(num !== 10){
    return f(num + 1); //you were returning nothing except when num reached 10
  } else {
    return num;
  }

}

var y = f(0);
console.log(y);
Recursive function returning undefined value

Recursive function returning undefined value


By : user3163583
Date : March 29 2020, 07:55 AM
Hope that helps Actually you return with the first child, regardless of the found node.
You could take a temporary variable and store the result of the children check and if not falsy return this value.
code :
function findObjectByUid(root, selectedUid) {
    if (root.uniqueId === selectedUid) return root;
    if (!root.children || !root.children.length) return;
    for (let child of root.children) {
        let temp = findObjectByUid(child, selectedUid);
        if (temp) return temp;
    }
}

var selectedObj = findObjectByUid(existingStructure, selectedUid);
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