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How to get a random number in Ruby
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If you're not only seeking for a number but also hex or uuid it's worth mentioning that the SecureRandom module found its way from ActiveSupport to the ruby core in 1.9.2+. So without the need for a full blown framework:
require 'securerandom'
p SecureRandom.random_number...
What does (x ^ 0x1) != 0 mean?
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^ is the bitwise XOR operation
0x1 is 1 in hex notation
x ^ 0x1 will invert the last bit of x (refer to the XOR truth table in the link above if that's not clear to you).
So, the condition (0 != ( x ^ 0x1 )) will be true if x is greater than 1 or if the last bit of ...
Parsing HTML into NSAttributedText - how to set font?
...ability to set text color, just add color to style attribute with value in hex string format color: #000000. See this link for converting UIColor to hex string: gist.github.com/yannickl/16f0ed38f0698d9a8ae7
– Miroslav Hrivik
Aug 16 '17 at 14:19
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Find CRLF in Notepad++
...ither Ctrl+M, $ nor \r\n are matched.
The same wiki also mentions the Hex editor alternative:
Type the new string at the beginning of the document.
Then select to view the document in Hex mode.
Select one of the new lines and hit Ctrl+H.
While you have the Replace dialog box up...
What does the git index contain EXACTLY?
...e we haven't modified the file
The first bytes are seconds since EPOCH in hex:
date --date="@$(printf "%x" "540976e6")"
Gives:
Fri Sep 5 10:40:06 CEST 2014
Which is when I made this example.
The second 4 bytes are nanoseconds.
UID and GID are 00 00 03 e8, 1000 in hex: a common value for sin...
How do I print a double value with full precision using cout?
...ctual double (with NO ROUND OFF ERROR) is to print out the binary bits (or hex nybbles).
One way of doing that is using a union to type-pun the double to a integer and then printing the integer, since integers do not suffer from truncation or round-off issues. (Type punning like this is not supporte...
When to use -retainCount?
...umber like 1152921504606846975 looks very mysterious until you write it in hex and get 0xfffffffffffffff. And 9223372036854775807 is 0x7fffffffffffffff in hex. And it really is not so surprising that someone would choose to use values like these as flags, given that it would take almost 3000 years ...
How to generate a git patch for a specific commit?
...ied.
The "base commit" is shown as "base-commit: " followed by the 40-hex of
the commit object name.
A "prerequisite patch" is shown as "prerequisite-patch-id: " followed by the 40-hex "patch id", which can be obtained by passing the patch through the "git patch-id --stable" command.
Gi...
urlencode vs rawurlencode?
...ers except -_.~ have been replaced with a percent (%) sign followed by two hex digits. This is the encoding described in » RFC 3986 for protecting literal characters from being interpreted as special URL delimiters, and for protecting URLs from being mangled by transmission media with character con...
How to test if a string is basically an integer in quotes using Ruby
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You've got the right idea, but it doesn't match binary or hex literals (see my edited solution below).
– Sarah Mei
Aug 6 '09 at 3:56
16
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