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Dave B Daxx

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  • Hull, UK
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@c80609a
c80609a / integer.rb
Created November 8, 2016 11:38 — forked from pithyless/integer.rb
Ruby Integer::MAX and Integer::MIN
class Integer
N_BYTES = [42].pack('i').size
N_BITS = N_BYTES * 16
MAX = 2 ** (N_BITS - 2) - 1
MIN = -MAX - 1
end
p Integer::MAX #=> 4611686018427387903
p Integer::MAX.class #=> Fixnum
p (Integer::MAX + 1).class #=> Bignum
@igorgatis
igorgatis / hexdump.js
Created March 15, 2016 16:42
Simple hexdump in Javascript
function hexdump(buffer, blockSize) {
blockSize = blockSize || 16;
var lines = [];
var hex = "0123456789ABCDEF";
for (var b = 0; b < buffer.length; b += blockSize) {
var block = buffer.slice(b, Math.min(b + blockSize, buffer.length));
var addr = ("0000" + b.toString(16)).slice(-4);
var codes = block.split('').map(function (ch) {
var code = ch.charCodeAt(0);
return " " + hex[(0xF0 & code) >> 4] + hex[0x0F & code];
@ph3nx
ph3nx / timestamp.rb
Created January 16, 2014 08:36
Handy method to get the current unix time stamp in Ruby. Unix time, or POSIX time, is a system for describing instants in time, defined as the number of seconds that have elapsed since 00:00:00 Coordinated Universal Time (UTC), Thursday, 1 January 1970.
def timestamp
Time.now.to_i
end
@acook
acook / keypress.rb
Created December 2, 2012 18:42
Read keypresses from user in terminal, including arrow keys using pure Ruby. This has since been folded into a much more robust gem called Remedy. https://rubygems.org/gems/remedy & https://github.com/acook/remedy
require 'io/console'
# Reads keypresses from the user including 2 and 3 escape character sequences.
def read_char
STDIN.echo = false
STDIN.raw!
input = STDIN.getc.chr
if input == "\e" then
input << STDIN.read_nonblock(3) rescue nil