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Foreign Key to non-primary key
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Ian PrestonIan Preston
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Is it safe to ignore the possibility of SHA collisions in practice?
... we have a billion unique images, one megabyte each.
We calculate the SHA-256 hash for the contents of each file.
The possibility of collision depends on:
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A fast method to round a double to a 32-bit int explained
... bits of mantissa.
Now, to the magic number; as you correctly stated, 6755399441055744 is 2^51 + 2^52; adding such a number forces the double to go into the "sweet range" between 2^52 and 2^53, which, as explained by Wikipedia here, has an interesting property:
Between 252=4,503,599,627,370,4...
Ternary operation in CoffeeScript
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Since everything is an expression, and thus results in a value, you can just use if/else.
a =...
Python: How would you save a simple settings/config file?
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edited Nov 29 '19 at 12:55
answered Sep 29 '13 at 13:42
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Can a constructor in Java be private?
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How can I get Knockout JS to data-bind on keypress instead of lost-focus?
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answered Dec 8 '10 at 19:25
Sergei GolosSergei Golos
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How to jQuery clone() and change id?
...ments, retrieve highest ID
Say you have many elements with IDs like klon--5 but scrambled (not in order). Here we cannot go for :last or :first, therefore we need a mechanism to retrieve the highest ID:
const $all = $('[id^="klon--"]');
const maxID = Math.max.apply(Math, $all.map((i, el) =>...
Covariance, Invariance and Contravariance explained in plain English?
...(A)) = parametertype(method asdeclaredin(B)) when overriding. Since Java 1.5, covariant return types are permitted when overriding, i.e. the following will compile in Java 1.5, but not in Java 1.4:
class Collection {
Iterator iterator() { ... }
}
class List extends Collection {
@Override
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