大约有 42,000 项符合查询结果（耗时：0.0619秒） [XML]
json_decode to array
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edited Apr 23 '14 at 17:29
Francisco Corrales Morales
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Elements order in a “for (… in …)” loop
... left undefined by the ECMAScript specification.
In ECMA-262, section 12.6.4:
The mechanics of enumerating the properties ... is implementation dependent.
However, specification is quite different from implementation. All modern implementations
of ECMAScript iterate through object properties in th...
Why are Python lambdas useful? [closed]
...ions to do stuff. Example:
mult3 = filter(lambda x: x % 3 == 0, [1, 2, 3, 4, 5, 6, 7, 8, 9])
sets mult3 to [3, 6, 9], those elements of the original list that are multiples of 3. This is shorter (and, one could argue, clearer) than
def filterfunc(x):
return x % 3 == 0
mult3 = filter(filterfu...
Why is a boolean 1 byte and not 1 bit of size?
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214
Because the CPU can't address anything smaller than a byte.
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How to convert floats to human-readable fractions?
Let's say we have 0.33 , we need to output 1/3 .
If we have 0.4 , we need to output 2/5 .
26 Answers
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What's the -practical- difference between a Bare and non-Bare repository?
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edited Jan 24 '19 at 12:53
Enrico
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How to randomly select an item from a list?
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14 Answers
14
Active
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What's better to use in PHP, $array[] = $value or array_push($array, $value)?
... almost 50% faster than the second one.
Some benchmark results:
Run 1
0.0054171085357666 // array_push
0.0028800964355469 // array[]
Run 2
0.0054559707641602 // array_push
0.002892017364502 // array[]
Run 3
0.0055501461029053 // array_push
0.0028610229492188 // array[]
This shouldn't be surprisin...
Illegal mix of collations (utf8_unicode_ci,IMPLICIT) and (utf8_general_ci,IMPLICIT) for operation '=
...RE clause:
CREATE PROCEDURE updateProductUsers(
IN rUsername VARCHAR(24),
IN rProductID INT UNSIGNED,
IN rPerm VARCHAR(16))
BEGIN
UPDATE productUsers
INNER JOIN users
ON productUsers.userID = users.userID
SET productUsers.permission = rPerm
WHERE user...