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What should every JavaScript programmer know? [closed]
Is there a set of things that every JavaScript programmer should know to be able to say "I know JavaScript"?
30 Answers
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Convert SQLITE SQL dump file to POSTGRESQL
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As usual, if you have foreign keys then you'll probably want to look into set constraints all deferred to avoid insert ordering problems, placing the command inside the BEGIN/COMMIT pair.
Thanks to Nicolas Riley for the boolean, blob, and constraints notes.
If you have ` on your code, as generated ...
Why (0-6) is -6 = False? [duplicate]
...o allows you to configure whether to enable this integer caching, and even set the lower and upper bounds. But in general, objects retrieved from different origins will not be identical. If you want to compare equality, just use ==.
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Get property value from string using reflection
...n this.GetType().GetProperty(propertyName).GetValue(this, null); }
set { this.GetType().GetProperty(propertyName).SetValue(this, value, null); }
}
public string Bar { get; set; }
}
Then, you can use as:
Foo f = new Foo();
// Set
f["Bar"] = "asdf";
// Get
string s = (string)f["Bar...
What is the Windows equivalent of the diff command?
...r linux commands that you can use from the windows command line.
You can set the PATH variable by right clicking on Computer and selecting Properties. Then you can click on Advanced System Settings on the left side of the screen. In the pop up, click Environment Variables and then either add or up...
Get push notification while App in foreground iOS
...nchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
// set the delegate in didFinishLaunchingWithOptions
UNUserNotificationCenter.current().delegate = self
...
}
share
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How to add a browser tab icon (favicon) for a website?
...There are a number of different icons and even splash screens that you can set for various devices. This answer goes through how to support them all.
Here are some snippets I have used with relevant links to where I gathered the information. See my blog for more information and more information abo...
What are some (concrete) use-cases for metaclasses?
... on, but one that iterates over the class attributes in __init__ before re-setting the class attributes is more efficient and keeps things up to date:
class _Interactify(type):
def __init__(cls, name, bases, d):
super(_Interactify, cls).__init__(name, bases, d)
for base in bases...
Is there an ignore command for git like there is for svn?
..., and will thus only apply locally in this one working copy.
You can also set up a global file with patterns to ignore with git config --global core.excludesfile. This will locally apply to all git working copies on the same user's account.
Run git help gitignore and read the text for the details....
Fastest way to find second (third…) highest/lowest value in vector or column
...;- length(x)
if(N>len){
warning('N greater than length(x). Setting N=length(x)')
N <- length(x)
}
sort(x,partial=len-N+1)[len-N+1]
}
microbenchmark::microbenchmark(
Rfast = Rfast::nth(x,5,descending = T),
maxn = maxN(x,5),
order = x[order(x, decreasing...