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优惠券批量生成及导入的思路 - 闲聊区 - 清泛IT论坛，有思想、有深度
...;$n = mt_rand(0, PHP_INT_MAX);
$m = base_convert($m, 10, 36); // 主随机
$n = base_convert($n, 10, 36); // 辅随机
$r = substr($m . $n, 0, 16);
...
Rails filtering array of objects by attribute value
...ts
This will be array of attachment objects
Use select method to filter based on file_type.
@logos = @attachments.select { |attachment| attachment.file_type == 'logo' }
@images = @attachments.select { |attachment| attachment.file_type == 'image' }
This will not trigger any db query.
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How to sort an ArrayList in Java [duplicate]
... of this class and adding each fruit in the list. I want to sort this list based on the order of fruit name.
3 Answers
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Linq select objects in list where exists IN (A,B,C)
I have a list of orders .
I want to select orders based on a set of order statuses.
5 Answers
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How to perform better document version control on Excel files and SQL schema files
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Tante recommended a very simple approach in Managing ZIP-based file formats in Git:
Open your ~/.gitconfig file (create if not existing already) and add
the following stanza:
[diff "zip"]
textconv = unzip -c -a
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What is hashCode used for? Is it unique?
...eful distribution in a
hash table. For uniqueness, the hash code must be based on the value
of an instance field or property instead of a static field or
property.
Objects used as a key in a Hashtable object must also override the
GetHashCode method because those objects must generate t...
Should I use an exception specifier in C++?
...w listed exceptions (possibly none). bullet Enable compiler optimizations based on the knowledge that only listed exceptions (possibly none) will be thrown. The above expectations are, again, deceptively close to being correct" No, the above expectations are absolutely correct.
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Python: Get the first character of the first string in a list?
...t first char) of string.
If you have the following structure:
mylist = ['base', 'sample', 'test']
And want to get fist char for the first one string(item):
myList[0][0]
>>> b
If all first chars:
[x[0] for x in myList]
>>> ['b', 's', 't']
If you have a text:
text = 'b...
Remove a character from the end of a variable
...cludes realpath. For instance, I'm running Linux Mint 17 (which is Ubuntu based) and it doesn't have it by default. It's in the repos, but it's not installed automatically. That's what the link I posted was discussing.
– Matthew
Jul 11 '14 at 13:30
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What is the difference between “#!/usr/bin/env bash” and “#!/usr/bin/bash”?
...cinctly what the env shebang does, rather than saying "chooses the program based on your system configuration"
– De Novo
Nov 16 '18 at 17:57
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