Kalman Hazins kalmanh

kalmanh / define_and_call_method.rb

Created October 1, 2020 20:16

	class DynamicallyDefineAndCall
	def method_missing(method, *args)
	puts method

	self.class.send(:define_method, method) do
	puts 'take it easy now'
	end

	send method
	end

kalmanh / allScrape.js

Last active December 3, 2017 05:54 — forked from bmorelli25/allScrape.js

Scrape all books on the homepage - without a for loop

	const puppeteer = require('puppeteer');

	let scrape = async () => {
	const browser = await puppeteer.launch({headless: true});
	const page = await browser.newPage();

	await page.goto('http://books.toscrape.com/');

	const result = await page.evaluate(() => {
	let elements = document.querySelectorAll('.product_pod'); // Select all Products

kalmanh / car.rb

Created July 30, 2017 04:23

Example of inclusion validation

	class Car < ActiveRecord::Base
	validates :color, inclusion: { in: [ "green", "red", "None" ] }
	end

kalmanh / gist:7a9880b5fefa2b9b2cef

Created May 22, 2014 14:01

Using symbols as keys in hash vs. strings

	require 'benchmark'

	NUM_TIMES = 100000000
	ARR = (5000..10000).to_a

	hash1 = {}
	strings = %w{"Lorem ipsum bla abra kadabra"}
	strings.each do \|str\|
	hash1[str] = ARR.sample
	end

kalmanh / converter_script.rb

Last active October 24, 2016 19:34

Ruby script to convert .mdb db file into .csv

	# Export data from Microsoft Access .mdb database into .csv files
	# using https://github.com/brianb/mdbtools
	# Install with homebrew - "brew install mdbtools"

	class ConverterScript
	tables = `mdb-tables -d , your_db_name.mdb`.chop.split(",")

	tables.each do \|table\|
	exists = system("mdb-export your_db_name.mdb '#{table}'")
	`mdb-export your_db_name.mdb '#{table}' > #{table.gsub(" ", "_")}.csv` if exists

kalmanh / rand_benchmarker.rb

Created July 19, 2013 05:59

Shows how much slower Random.new.rand() is vs. Kernel's rand()

kalmanh / fibonacci_test.rb

Created April 25, 2013 22:33

Comparing Fibonacci memoization using class variable vs. class instance variable

	require 'benchmark'

	class Fibonacci_Class_Data_Variable
	@@memo = { 0 => 0, 1 => 1 }

	def self.fib_rec(n)
	@@memo[n] \|\|= fib_rec(n - 1) + fib_rec(n - 2)
	end
	end

kalmanh / gist:3004902

Created June 27, 2012 15:39