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How does php's foreach decides the order of iteration, for an array with strings as keys?


How does php's foreach decides the order of iteration, for an array with strings as keys?

By : dotnetski
Date : November 17 2020, 11:55 AM
hop of those help? They will be iterated in the same order they are in the array. Most likely in the insertion order (if array_push/array_merge or the [] operator was used). That also holds for keys other than strings.
code :


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What decides the order of keys when I print a Perl hash?

What decides the order of keys when I print a Perl hash?


By : user1663246
Date : March 29 2020, 07:55 AM
To fix the issue you can do Elements of a hash are printed out in their internal order, which can not be relied upon and will change as elements are added and removed. If you need all of the elements of a hash in some sort of order, sort the keys, and use that list to index the hash.
If you are looking for a structure that holds its elements in order, either use an array, or use one of the ordered hash's on CPAN.
knockout foreach iteration through an array of strings

knockout foreach iteration through an array of strings


By : SFDEV
Date : March 29 2020, 07:55 AM
wish of those help I found this, but this doesn't work for me: Bind to simple array of strings , The problem is (probably) on this line :
code :
this.RouteUrls().push(this.urlToAdd());
this.RouteUrls.push(this.urlToAdd());
why does PHPs preg_match work differently on strings vs. string_literals for extracting data into a named array?

why does PHPs preg_match work differently on strings vs. string_literals for extracting data into a named array?


By : Ritesh
Date : March 29 2020, 07:55 AM
To fix this issue Just for the sake of it, here is an implementation that avoids regex altoegther.
code :
$doc = new DOMDocument();
$doc->loadHTML($decodedMessage);
$xpath = new DOMXPath($doc);

$info = array(
  'sender'         => get_info($xpath, 'Sender:'),
  'customer_id'    => get_info($xpath, 'Customer ID:'),
  'email'          => get_info($xpath, 'Email:'),
  'transaction_id' => get_info($xpath, 'Transaction ID:'),
  'reference'      => get_info($xpath, 'Reference:'),
  'explanation'    => get_info($xpath, 'Explanation:')
);


function get_info($xpath_object, $info) 
{
    $result = null;
    $path   = "//strong[contains(., '$info')]/following-sibling::text()[1]";
    $nodes  = $xpath_object->query($path);

    foreach ($nodes as $node)
    {
        $result = $node->textContent;
        break;
    }

    return $result;
}
Does this Object.keys(o).forEach(...) iteration in node.js GC keys when it's done?

Does this Object.keys(o).forEach(...) iteration in node.js GC keys when it's done?


By : Nicoloss
Date : March 29 2020, 07:55 AM
Does that help Yes, the memory will be freed implicitly after the forEach has completed, as afterwards nothing on the stack will reference the array created by Object.keys any more. (There is no variable to nullify, btw)
You could've written equivalently
code :
{
    const keys = Object.keys(obj);
    keys.forEach(function(key) {
        const val = o[key];
        logic();
    });
}
Is the order of iteration for javascript array methods (map, forEach, reduce, etc) deterministic?

Is the order of iteration for javascript array methods (map, forEach, reduce, etc) deterministic?


By : Rajitha - The Dreame
Date : March 29 2020, 07:55 AM
like below fixes the issue The callback function is called for each element present in the array, in ascending order. It is not called for missing elements. (Missing elements? Yes, JavaScript handle sparse arrays)
code :
var test = [];
test[30] = 'Test'; // sparse array, only one element defined.

test.forEach(
  function(value){
    console.log(value); // will only be called one time.
  }
);
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