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How to drop unique in MySQL?
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Simply you can use the following SQL Script to delete the index in MySQL:
alter table fuinfo drop index email;
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JavaScript variables declare outside or inside loop?
...riables outside loops for increased performance. Is this the case with JavaScript as well? Which is better / faster / best-practice?
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VIP会员中心 · App Inventor 2 中文网，少儿编程陪伴者
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How to parse JSON using Node.js? [closed]
...ply use JSON.parse.
The definition of the JSON object is part of the ECMAScript 5 specification. node.js is built on Google Chrome's V8 engine, which adheres to ECMA standard. Therefore, node.js also has a global object JSON[docs].
Note - JSON.parse can tie up the current thread because it is a ...
What is the purpose of setting a key in data.table?
... 20,000 joins like this on a full table of zip codes. With data tables the script took about 20 min. to run. I didn't even try it with data frames because it would have taken more than 2 weeks.
IMHO you should not just read but study the FAQ and Intro material. It's easier to grasp if you have an a...
Is there any way to view the currently mapped keys in Vim?
... and avoid temp files whenever you need to search mappings, take a look to scriptease and :Verbose command.
It is a wrapper on :verbose to show result in a preview window.
this way you can search whatever you want inside results without using temp files
type :Verbose map and use / ? as usual.
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Calculate distance between 2 GPS coordinates
...istance between two coordinates by latitude and longitude, including a Javascript implementation.
West and South locations are negative.
Remember minutes and seconds are out of 60 so S31 30' is -31.50 degrees.
Don't forget to convert degrees to radians. Many languages have this function. Or it...
Select the values of one property on all objects of an array in PowerShell
...r alternative:
# By property name (string):
$objects.ForEach('Name')
# By script block (more flexibility; like ForEach-Object)
$objects.ForEach({ $_.Name })
This approach is similar to member enumeration, with the same tradeoffs, except that pipeline logic is not applied; it is marginally slower,...
Is there “0b” or something similar to represent a binary number in Javascript
I know that 0x is a prefix for hexadecimal numbers in Javascript. For example, 0xFF stands for the number 255.
10 Answe...
How to set the prototype of a JavaScript object that has already been instantiated?
Suppose I have an object foo in my JavaScript code. foo is a complex object and it is generated somewhere else. How can I change the prototype of the foo object?
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