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Unexpected FrozenError when appending elements via <<


Unexpected FrozenError when appending elements via <<

By : Akram Khan
Date : October 16 2020, 06:10 PM
To fix this issue I needed to add the first name to an array and then that array to the hash.
code :
new_hash = Hash.new
hash.each do |name , category|
  if new_hash.key?(category)
    new_file[category] << name 
  else
    new_hash[category] = [name] # <- must be an array    
  end
end


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What is better, appending new elements via DOM functions, or appending strings with HTML tags?

What is better, appending new elements via DOM functions, or appending strings with HTML tags?


By : Czech Timber
Date : March 29 2020, 07:55 AM
I hope this helps . I have seen a few different methods to add elements to the DOM. The most prevelent seem to be, for example, either , Some notes:
code :
function contains(parent, descendant) {
    return Boolean(parent.compareDocumentPosition(descendant) & 16);
}
var p = document.getElementById("portalLink")
console.log(contains(document, p)); // true
document.body.innerHTML += "<p>It's clobberin' time!</p>";
console.log(contains(document, p)); // false
p = document.getElementById("portalLink")
console.log(contains(document, p)); // true
true
false
true
Appending Elements with JQuery Removes Previous Elements

Appending Elements with JQuery Removes Previous Elements


By : Rosihan Fahmi
Date : March 29 2020, 07:55 AM
wish help you to fix your issue I have a ul which gets appended several lis after an AJAX request. The previous elements in the list get removed, why is this? , Because of this
$comments.text('Loading...');
Appending and adding elements inside list which contains dictionaries as elements

Appending and adding elements inside list which contains dictionaries as elements


By : Wyapples
Date : March 29 2020, 07:55 AM
I wish did fix the issue. As much as I love groupby, I don't think is a good idea here. Your elements alternate veg and non-veg, but groupby expects the groups to be contiguous, which means it's only going to work if you first call sorted, at which point you're throwing away all the simplicity and performance benefits of doing things iteratively.
Meanwhile, without sorting, it'll be a lot easier to build up a dict, keyed off the key values, than a list that you have to keep searching for each key. For example:
code :
d = collections.defaultdict(lambda: dict(count=0, price=[], quality=''))
for entry in A:
    key = entry['key']
    target = d[key]
    target['count'] += entry['count']
    target['price'].extend(entry['price'])
    target['quality'] = 'something' # I don't know what your aggregation rule is
defaultdict(<function __main__.<lambda>>,
            {'non-veg': {'count': 250,
              'price': [10, 20, 30, 110, 220, 330]],
              'quality': 'something'},
             'veg': {'count': 300,
              'price': [100, 200, 300, 1, 2, 3]],
              'quality': 'something'}})
[dict(key=key, **value) for key, value in d.items()]
RAILS: can't modify frozen SystemStackError (FrozenError) after upgradeing to Ruby 2.5.3

RAILS: can't modify frozen SystemStackError (FrozenError) after upgradeing to Ruby 2.5.3


By : Jonbobbly
Date : March 29 2020, 07:55 AM
wish helps you You can try to either upgrade to the latest version of Rails 4.2 or use a Ruby version older than 2.3 (introduction of frozen_string_literal pragma). If neither of these work, look at the stacktrace and try to see if you're trying to modify an object that has been frozen.
FrozenError when creating new Watir Browser

FrozenError when creating new Watir Browser


By : David Brusius
Date : March 29 2020, 07:55 AM
it should still fix some issue Is it possible that firefox is not installed or not being found? There's a known bug for Webdriver will generate an error like this if you are on a newer version of Ruby and it can't locate the firefox executable. (all of which might change in the future when that issue is addressed)
if you read the issue, it's trying to do some magic with strings for the error message, but also wanting to use frozen strings, and thus the error (can't have it both ways)
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