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Remove duplicate values from JS array [duplicate]
...y(k) ? false : (seen[k] = true);
})
}
A particularly useful key() is JSON.stringify which will remove objects that are physically different, but "look" the same:
a = [[1,2,3], [4,5,6], [1,2,3]]
b = uniqBy(a, JSON.stringify)
console.log(b) // [[1,2,3], [4,5,6]]
If the key is not primitive, y...
【转】用App Inventor 2实现电子围栏功能 - App应用开发 - 清泛IT社区，为创新赋能！
...图的边界，值是一个包含了西北和东南坐标的嵌套列表，格式为((北西)(南东))CenterFromString地图中心Set the initial center coordinate of the map. The value is specified as a comma-separated pair of decimal latitude and longitude coordinates, for example, 42.359144, -71....
memory_get_peak_usage() with “real usage”
...at['PERCENTAGE_BREAK'] = sprintf("%0.2f", $percentage) . "%";
echo json_encode($stat, 128);
break;
}
$data .= str_repeat(' ', 1024 * 25); // 1kb every time
}
Output
Stoped at: 95.86%
{
"HIGHEST_MEMORY": "0.71",
"HIGHEST_DIFF": "0.24",
"PERCENTAGE_BREAK": "95....
Permutations in JavaScript?
... ch);
usedChars.pop();
}
return permArr
};
document.write(JSON.stringify(permute([5, 3, 7, 1])));
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Which characters need to be escaped in HTML?
...se rules are not for applied for them. For example, if you have to include JSON in a , replace < with \x3c, the U+2028 character with \u2028, and U+2029 with \u2029 after JSON serialisation.)
HTML Escape Characters: Complete List:
http://www.theukwebdesigncompany.com/articles/entity-escape-charac...
搭建高可用mongodb集群（一）——配置mongodb - 大数据 & AI - 清泛网 - 专...
...先为要存储的数据建立字段，随时可以存储自定义的数据格式。而在关系数据库里，增删字段是一件非常麻烦的事情。如果是非常大数据量的表，增加字段简直就是一个噩梦。
高可用，NoSQL在不太影响性能的情况，就可以方便...
How to design a database for User Defined Fields?
...d maybe opt for it but in 2017, Will you opt for something different? like json
– maztt
Feb 28 '17 at 11:52
...
When should I use RequestFactory vs GWT-RPC?
...domain objects to proxies more elegantly, something like JavaScript method JSON.stringify(..,,) is MISSING in RF toolbox.
Don't forget you are also responsible for setting transferable properties of your domain objects to proxies, and so on recursively.
POOR ERROR HANDLING on the server and - Stack...
What exactly is Hot Module Replacement in Webpack?
...n to this version. The "Update" contains two parts:
the update manifest (json)
one or multiple update chunks (js)
The manifest contains the new compilation hash and a list of all update chunks (2).
The update chunks contain code for all updated modules in this chunk (or a flag if a module was r...
How do I (or can I) SELECT DISTINCT on multiple columns?
...ata type of the column must support the <> operator. Some types like json don't. See:
How to query a json column for empty objects?
Subtle difference in NULL handling
This query (unlike the currently accepted answer by Joel) does not treat NULL values as equal. The following two rows for ...