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How do you downgrade rubygems?
I have rubygems 1.3.1 installed but I want to go back to 1.2.0. What's the command to downgrade rubygems?
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Replacing blank values (white space) with NaN in pandas
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Generate random string/characters in JavaScript
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Int or Number DataType for DataAnnotation validation attribute
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edited Oct 23 '17 at 9:46
Nisarg
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?: operator (the 'Elvis operator') in PHP
...lse ?: 0); // 0
var_dump(null ?: 'foo'); // 'foo'
var_dump(true ?: 123); // true
var_dump('rock' ?: 'roll'); // 'rock'
?>
By the way, it's called the Elvis operator.
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How to set 'auto' for upper limit, but keep a fixed lower limit with matplotlib.pyplot
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You can pass just left or right to set_xlim:
plt.gca().set_xlim(left=0)
For the y axis, use...
How to merge 2 JSON objects from 2 files using jq?
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Since 1.4 this is now possible with the * operator. When given two objects, it will merge them...
JS文字卷动效果的调用函数：startmarquee - 更多技术 - 清泛网 - 专注C/C++及内核技术
...隔越大，滚动速度越慢；
if(!p){ o.scrollTop += 1;}
//滚动停止或开始，取决于p传来的布尔值；
}
function scrolling(){
if(o.scrollTop%lh!=0){
//如果不被整除，即一次上移的高度达不到lh，则内容会继续...
What is `git diff --patience` for?
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You can read a post from Bram Cohen, the author of the patience diff algorithm, but I found th...
Does Ruby regular expression have a not match operator like “!~” in Perl?
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Yes: !~ works just fine – you probably thought it wouldn’t because it’s missing from the...