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Why does Haskell's “do nothing” function, id, consume tons of memory?
Haskell has an identity function which returns the input unchanged. The definition is simple:
1 Answer
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When is an interface with a default method initialized?
...nough to trigger the initialization. The default method doesn't have to be called or overridden or even mentioned, nor does the presence of an abstract method trigger initialization.
My speculation is that the HotSpot implementation wanted to avoid adding class/interface initialization checking int...
What is the difference between ? and Object in Java generics?
...n't know the type of the value (it's ?), you don't know if if it's safe to call put(key, "x"), put(key, 0), or anything else.
– erickson
Jan 26 '16 at 19:50
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What is the http-header “X-XSS-Protection”?
...ew/…), also because it does not have any mean to detect Stored XSS (also called Persistent XSS).
– Luca Invernizzi
Jul 21 '12 at 2:31
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Comparing mongoose _id and strings
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Mongoose uses the mongodb-native driver, which uses the custom ObjectID type. You can compare ObjectIDs with the .equals() method. With your example, results.userId.equals(AnotherMongoDocument._id). The ObjectID type also has a toString() method, if you wish to store a stringified version of t...
Linq to Entities join vs groupjoin
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Behaviour
Suppose you have two lists:
Id Value
1 A
2 B
3 C
Id ChildValue
1 a1
1 a2
1 a3
2 b1
2 b2
When you Join the two lists on the Id field the result will be:
Value ChildValue
A a1
A a2
A a3
B b1
B b2
When you GroupJoin...
mysql :: insert into table, data from another table?
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INSERT INTO action_2_members (campaign_id, mobile, vote, vote_date)
SELECT campaign_id, from_number, received_msg, date_received
FROM `received_txts`
WHERE `campaign_id` = '8'
share
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Sort objects in an array alphabetically on one property of the array
... least remember the linting thing :)
– Michael Tranchida
May 18 '18 at 22:40
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Enums and Constants. Which to use when?
...lass with const strings that looks and acts like an enum but circumvents a call to ToString()? Example
– Sinjai
Jan 29 '18 at 0:28
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Iterate over object keys in node.js
... but ... why on earth show the key of the object being passed as something called "element", and the enumerator for the keys array called "key" ?! Can I suggest you update your code sample to use Object.keys(myObject).forEach(function(key, index, arrayOfKeys) {
– Andy Lorenz
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