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Double negation (!!) in javascript - what is the purpose? [duplicate]
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188
It casts to boolean. The first ! negates it once, converting values like so:
undefined to tr...
Python: Fetch first 10 results from a list [duplicate]
Is there a way we can fetch first 10 results from a list. Something like this maybe:
4 Answers
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Pass column name in data.table using variable [duplicate]
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1 Answer
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How to convert a date string to different format [duplicate]
I need to convert date string "2013-1-25" to string "1/25/13" in python.
I looked at the datetime.strptime but still can't find a way for this.
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SQL: How to perform string does not equal
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179
Your where clause will return all rows where tester does not match username AND where tester i...
How do I zip two arrays in JavaScript? [duplicate]
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217
Use the map method:
var a = [1, 2, 3]
var b = ['a', 'b', 'c']
var c = a.map(function(e,...
error C2664: “std::list::list(const std::allocator &)”: 不能将参数 1...
...rror C2664: “std::list::list(const std::allocator &)”: 不能将参数 1 从 “std::vector”转换为“const std::allocator &”错误日志：error C2664: std::list<_Ty>::list(const std::allocator<_Ty> &): 不能将参数 1 从std::vector<_Ty>转换为const std::...错误日志：
error C...
ORACLE 常用日期函数 - 数据库(内核) - 清泛网 - 专注C/C++及内核技术
...，返回值日期之前几个月日期。
select add_months(to_date('20150201','yyyymmdd'), -1) from dual
结果：2015/1/1
相应的，加减天数add_days函数是不存在的，直接用+、-即可，例如：
select to_date('20150201','yyyymmdd')+1 from dual
结果：2015/2/2
当月...
PHP操作MongoDB时的整数问题及对策 - 大数据 & AI - 清泛网 - 专注C/C++及内核技术
...先来生成一些测试数据：
<?php
ini_set('mongo.native_long', 1);
$instance = new Mongo();
$instance = $instance->selectCollection('test', 'test');
for ($i = 0; $i < 10; $i++) {
$instance->insert(array(
'group_id' => rand(1, 5),
'count' => rand(1, 5),
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