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What is the fastest or most elegant way to compute a set difference using Javascript arrays?
...don't know if this is most effective, but perhaps the shortest
A = [1, 2, 3, 4];
B = [1, 3, 4, 7];
diff = A.filter(function(x) { return B.indexOf(x) < 0 })
console.log(diff);
Updated to ES6:
A = [1, 2, 3, 4];
B = [1, 3, 4, 7];
diff = A.filter(x => !B.includes(x) );
console.log(diff);
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Install dependencies globally and locally using package.json
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answered May 30 '12 at 9:05
Jason LivesayJason Livesay
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Any way to modify Jasmine spies based on arguments?
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CentOS+Nginx+PHP+MySQL详细配置(图解) - PHP - 清泛IT论坛，有思想、有深度
本帖最后由 zqp2013 于 2015-4-26 14:29 编辑
一、安装MySQL
目前web服务器已经很少有跑静态页面的，如果要跑动态网站那当然就离不开数据库，虽然在以前文章中有写MySQL是怎么安装的，但是感觉好久没...
What is the HEAD in git?
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edited Nov 30 '16 at 12:30
Maroun
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Finding # occurrences of a character in a string in Ruby
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How do I detect whether a Python variable is a function?
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934
If this is for Python 2.x or for Python 3.2+, you can also use callable(). It used to be deprec...
How can I multiply and divide using only bit shifting and adding?
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answered May 5 '10 at 22:31
Andrew ToulouseAndrew Toulouse
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Iterating over each line of ls -l output
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Randy ProctorRandy Proctor
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