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Why does (“foo” === new String(“foo”)) evaluate to false in JavaScript?
..."foo" is a string primitive. (this concept does not exist in C# or Java)
new String("foo") is boxed string object.
The === operator behaves differently on primitives and objects.
When comparing primitives (of the same type), === will return true if they both have the same value.
When comparing o...
How do I find which transaction is causing a “Waiting for table metadata lock” state?
...unction () {
StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2fstackoverflow.com%2fquestions%2f13148630%2fhow-do-i-find-which-transaction-is-causing-a-waiting-for-table-metadata-lock-s%23new-answer', 'question_page');
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How to have multiple data-bind attributes on one element?
...iewModel.tasks = ko.observableArray(tsks) then changing viewModel.tasks = [new Array], How to tell knock that array is changed
– user960567
May 22 '12 at 10:35
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How do I configure Maven for offline development?
...l repository (of course changes in the dependencies / plugins will require new internet / central repository access).
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Copy / Put text on the clipboard with FireFox, Safari and Chrome
... focus to a hidden TextArea control and either set its contents to desired new clipboard contents for copy or read its contents after the event had finished for paste.
see also Is it possible to read the clipboard in Firefox, Safari and Chrome using Javascript?
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Gson ignoring map entries with value=null
...ere's how you would configure a Gson instance to output null:
Gson gson = new GsonBuilder().serializeNulls().create();
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Multiple queries executed in java in single statement
...ure you can Insert what you want.
The only thing is you might not get the newly inserted rows in the Result Set if you Insert after the Select.
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problem with and :after with CSS in WebKit
...ect::-ms-expand {
display: none;
}
I have used FontAwesome.io for my new arrow, but you can use whatever else you want. Obviously this is not a perfect solution, but depending on your needs it might be enough.
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Specifying column name in a “references” migration
...you write
belongs_to :author, class_name: "User"
Note, when creating a new table you can write it as follows:
create_table :things do |t|
t.belongs_to :author, references: :users
end
Note: the schema_plus gem in it's entirety is not compatible with rails 5+, but this functionality is...
Change the URL in the browser without loading the new page using JavaScript
...ge the URL in the browser so if the user hits reload or bookmark, then the new URL is used?
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