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countdown.ipynb

{
 "cells": [
  {
   "cell_type": "code",
   "execution_count": 10,
   "metadata": {
    "collapsed": false
   },
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "10\n",
      "9\n",
      "8\n",
      "7\n",
      "6\n",
      "5\n",
      "4\n",
      "3\n",
      "2\n",
      "1\n",
      "0\n"
     ]
    }
   ],
   "source": [
    "var i = 11;\n",
    "\n",
    "while ( i-- ){ // exists because 0 is false in JS\n",
    "    console.log(i)\n",
    "}"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "JavaScript does not come with batteries included.\n",
    "\n",
    "So what is so easy in Ruby:\n",
    "\n",
    "```ruby\n",
    "(\"a\"..\"z\").to_a\n",
    "```\n",
    "\n",
    "has to be done by hand in JavaScript. \n",
    "\n",
    "It is an opportunity to learn! (Or to look for a library.)\n",
    "\n",
    "See the recipe for lowercase letters [here](http://rosettacode.org/wiki/Generate_lower_case_ASCII_alphabet#JavaScript)."
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 11,
   "metadata": {
    "collapsed": true
   },
   "outputs": [],
   "source": [
    "var lowercase_letters = function (cFrom, cTo) {\n",
    " \n",
    "  function cRange(cFrom, cTo) {\n",
    "    var iStart = cFrom.charCodeAt(0);\n",
    " \n",
    "    return Array.apply(\n",
    "      null, Array(cTo.charCodeAt(0) - iStart + 1)\n",
    "    ).map(function (_, i) {\n",
    " \n",
    "      return String.fromCharCode(iStart + i);\n",
    " \n",
    "    });\n",
    "  }\n",
    " \n",
    "  return cRange(cFrom, cTo);\n",
    " \n",
    "};"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 12,
   "metadata": {
    "collapsed": false
   },
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "a\n",
      "b\n",
      "c\n",
      "d\n",
      "e\n",
      "f\n",
      "g\n",
      "h\n",
      "i\n",
      "j\n",
      "k\n",
      "l\n",
      "m\n",
      "n\n",
      "o\n",
      "p\n",
      "q\n",
      "r\n",
      "s\n",
      "t\n",
      "u\n",
      "v\n",
      "w\n",
      "x\n",
      "y\n",
      "z\n"
     ]
    }
   ],
   "source": [
    "var letters = lowercase_letters('a', 'z'),\n",
    "    i = letters.length,\n",
    "    letter;\n",
    "\n",
    "letters.reverse();\n",
    "while ( i-- ){\n",
    "    letter = letters[i];\n",
    "    console.log(letter);\n",
    "}"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 13,
   "metadata": {
    "collapsed": false
   },
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "9\n",
      "8\n",
      "7\n",
      "6\n",
      "5\n",
      "4\n",
      "3\n",
      "2\n",
      "1\n",
      "0\n"
     ]
    }
   ],
   "source": [
    "// recursive countdown\n",
    "\n",
    "var countdown = function countdown(x){\n",
    "    if (x === 0){\n",
    "        return;\n",
    "    }\n",
    "    x -= 1;\n",
    "    console.log(x);\n",
    "    return countdown(x);\n",
    "}\n",
    "countdown(10);"
   ]
  }
 ],
 "metadata": {
  "kernelspec": {
   "display_name": "NodeJS",
   "language": "javascript",
   "name": "nodejs"
  },
  "language_info": {
   "codemirror_mode": "javascript",
   "file_extension": ".js",
   "mimetype": "text/javascript",
   "name": "nodejs",
   "pygments_lexer": "javascript",
   "version": "0.10"
  }
 },
 "nbformat": 4,
 "nbformat_minor": 0
}

countdown.js

var i = 11;

while ( i-- ){ // exists because 0 is false in JS
    console.log(i)
}

var lowercase_letters = function (cFrom, cTo) {
 
  function cRange(cFrom, cTo) {
    var iStart = cFrom.charCodeAt(0);
 
    return Array.apply(
      null, Array(cTo.charCodeAt(0) - iStart + 1)
    ).map(function (_, i) {
 
      return String.fromCharCode(iStart + i);
 
    });
  }
 
  return cRange(cFrom, cTo);
 
};

var letters = lowercase_letters('a', 'z'),
    i = letters.length,
    letter;

letters.reverse();
while ( i-- ){
    letter = letters[i];
    console.log(letter);
}

// recursive countdown

var countdown = function countdown(x){
    if (x === 0){
        return;
    }
    x -= 1;
    console.log(x);
    return countdown(x);
}
countdown(10);

three_five_mod_sums.ipynb

three_five_mod_sums.rb

integers = [3, 5]
number_range = (0..10)

sum = integers.map {|n| number_range.step(n).to_a}
  .flatten
  .inject(:+)
puts sum

integers = [3, 5]
number_range = (0..10)

sum = integers.map {|n| number_range.step(n).to_a}
puts sum

integers = [3, 5]
number_range = (0..10)

sum = integers.map {|n| number_range.step(n).to_a}
  .flatten
puts sum

integers = [3, 5]
number_range = (0..10)

sum = integers.map {|n| number_range.step(n).to_a}
  .flatten
  .inject(:+)
puts sum

Untitled.txt