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Check if a method exists
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189
if ([obj respondsToSelector:@selector(methodName:withEtc:)]) {
[obj methodName:123 withEtc:...
Testing whether a value is odd or even
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return n % 2 == 0;
}
function isOdd(n) {
return Math.abs(n % 2) == 1;
}
You can check that any value in Javascript can be coerced to a number with:
Number.isFinite(parseFloat(n))
This check should preferably be done outside the isEven and isOdd functions, so you don't have to duplicate ...
How to skip to next iteration in jQuery.each() util?
...);
});
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
will log one, two, four, five.
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Sass .scss: Nesting and multiple classes?
...ements and -classes:
.element{
&:hover{ ... }
&:nth-child(1){ ... }
}
However, you can place the & at virtually any position you like*, so the following is possible too:
.container {
background:red;
#id &{
background:blue;
}
}
/* compiles to: */
.conta...
Declaration suffix for decimal type
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Documented in the C# language specification, chapter 2.4.4:
float f = 1.2f;
double d = 1.2d;
uint u = 2u;
long l = 2L;
ulong ul = 2UL;
decimal m = 2m;
Nothing for int, byte, sbyte, short, ushort.
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How do I make an http request using cookies on Android?
...t <NameValuePair>();
nvps.add(new BasicNameValuePair("IDToken1", "username"));
nvps.add(new BasicNameValuePair("IDToken2", "password"));
httpost.setEntity(new UrlEncodedFormEntity(nvps, HTTP.UTF_8));
response = httpclient.execute(httpost);
entity = res...
How do you sort a list in Jinja2?
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168
As of version 2.6, Jinja2's built-in sort filter allows you to specify an attribute to sort by...
Raise warning in Python without interrupting program
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165
You shouldn't raise the warning, you should be using warnings module. By raising it you're gen...
How to remove a lua table entry by its key?
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1 Answer
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Matplotlib scatterplot; colour as a function of a third variable
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157
There's no need to manually set the colors. Instead, specify a grayscale colormap...
import n...