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valueOf() vs. toString() in Javascript
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The reason why ("x="+x) gives "x=value" and not "x=tostring" is the following. When evaluating "+", javascript first collects primitive values of the operands, and then decides if addition or concatenation should be applied, based on the type...
How to convert a string of numbers to an array of numbers?
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My 2 cents for golfers:
b="1,2,3,4".split`,`.map(x=>+x)
backquote is string litteral so we can omit the parenthesis (because of the nature of split function) but it is equivalent to split(','). The string is now an array, we just have to map each value with a function ...
How to describe “object” arguments in jsdoc?
But how do I describe how the parameters object should be structured? For example it should be something like:
6 Answers
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getting the X/Y coordinates of a mouse click on an image with jQuery [duplicate]
I would like to use jQuery to get the X/Y coordinates of a click event on an image. The coordinates should be relative to the image, not relative to the whole page
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How to refresh app upon shaking the device?
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Here is an example code.
Put this into your activity class:
/* put this into your activity class */
private SensorManager mSensorManager;
private float mAccel; // acceleration apart from gravity
private float mAccelCurrent; // c...
Test if string is a number in Ruby on Rails
...t like this:
my_string = '12.34'
is_number?( my_string )
# => true
Extend String Class.
If you want to be able to call is_number? directly on the string instead of passing it as a param to your helper function, then you need to define is_number? as an extension of the String class, like so:
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Pandas index column title or name
How do I get the index column name in python pandas? Here's an example dataframe:
9 Answers
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glob exclude pattern
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The pattern rules for glob are not regular expressions. Instead, they follow standard Unix path expansion rules. There are only a few special characters: two different wild-cards, and character ranges are supported [from glob].
So you can exclude some files with pat...
PHP: How to remove all non printable characters in a string?
...ut everything from 0-31 and 127-255 with this:
$string = preg_replace('/[\x00-\x1F\x7F-\xFF]/', '', $string);
It matches anything in range 0-31, 127-255 and removes it.
8 bit extended ASCII?
You fell into a Hot Tub Time Machine, and you're back in the eighties.
If you've got some form of 8 bi...
Omitting the second expression when using the if-else shorthand
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This is also an option:
x==2 && dosomething();
dosomething() will only be called if x==2 is evaluated to true. This is called Short-circuiting.
It is not commonly used in cases like this and you really shouldn't write code like this. I en...