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Convert integer to hexadecimal and back again
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Since this has not been mentioned here: If you use a lowecase x (e.g. ToString("x4) you get a lowercase hex value (e.g. b76).
– Skalli
Feb 28 '14 at 9:17
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“for” vs “each” in Ruby
...erence:
each:
irb> [1,2,3].each { |x| }
=> [1, 2, 3]
irb> x
NameError: undefined local variable or method `x' for main:Object
from (irb):2
from :0
for:
irb> for x in [1,2,3]; end
=> [1, 2, 3]
irb> x
=> 3
With the for loop, the iterator variable still lives a...
Reverse of JSON.stringify?
...obj = JSON.parse(str); // this is how you parse a string into JSON
document.body.innerHTML += obj.hello;
} catch (ex) {
console.error(ex);
}
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Convert between UIImage and Base64 string
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Swift
First we need to have image's NSData
//Use image name from bundle to create NSData
let image : UIImage = UIImage(named:"imageNameHere")!
//Now use image to create into NSData format
let imageData:NSData = UIImagePNGRepresentation(image)!
//OR next possibility
//Use image's ...
How can I match on an attribute that contains a certain string?
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Here's an example that finds div elements whose className contains atag:
//div[contains(@class, 'atag')]
Here's an example that finds div elements whose className contains atag and btag:
//div[contains(@class, 'atag') and contains(@class ,'btag')]
However...
`static` keyword inside function?
I was looking at the source for Drupal 7, and I found some things I hadn't seen before. I did some initial looking in the php manual, but it didn't explain these examples.
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fatal: The current branch master has no upstream branch
...gular password won't work (for https url), as explained here or here.
Same problem if your password contains special character (as in this answer)
If https doesn't work (because you don't want to generate a secondary key, a PAT: personal Access Token), then you can switch to ssh, as I have shown...
How do I move a file with Ruby?
...eutils'
FileUtils.mv('/tmp/your_file', '/opt/new/location/your_file')
Remember; if you are moving across partitions, "mv" will copy the file to new destination and unlink the source path.
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Is there a difference between x++ and ++x in java?
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++x is called preincrement while x++ is called postincrement.
int x = 5, y = 5;
System.out.println(++x); // outputs 6
System.out.println(x); // outputs 6
System.out.println(y++); // outputs 5
System.out.println(y); // outputs 6
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Numbering rows within groups in a data frame
Working with a data frame similar to this:
7 Answers
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