shinout

newton_raphson = (f, x0)->
  x0 = Math.random() if typeof x0 isnt "number"
  fx0 = f(x0)
  x = x0 + 0.01 # for approximating gradient
  loop
    fx = f(x)
    gradient = (fx - fx0) / (x - x0)
    delta = fx/gradient
    break if Math.abs(delta) < 0.0000001
    x0 = x

shinout

  function deepCopy(val) {
    if (Array.isArray(val)) return val.map(deepCopy);
    if (typeof val != "object" || val === null || val === undefined) return val; 
    var ret = {};
    for (var attr in val) if (val.hasOwnProperty(attr)) ret[attr] = deepCopy(val[attr]);
    return ret; 
  }

shinout

// WW XXXX YYY ZZ -> get four characters (e.g. WXXZ)
// var G = [2, 4, 3, 2] // each stands for the number of W, X, Y, Z
// select(G, 4); // get all possible combinations
//   [  [2,2,0,0],  [2,1,1,0], [2,1,0,1] ... ] // each stands for the number of selected W, X, Y, Z

function sum(G) {
  return G.reduce(function(t,v){return v+t},0);
}
function copy(a) {
  return a.slice();

shinout

/**
 * transpose.js
 * @author SHIN Suzuki
 * 
 **/
 
/**
 * function transpose
 * 
 * @param chordStr (string): documents containing chords

shinout

function unique(arr) {
  var ret = [];
  for(var i=0, l=arr.length; i<l; i++) {
    for(var j=i+1; j<l; j++) {
      if (arr[i] === arr[j]) j = ++i;
    }
    ret.push(arr[i]);
  }
  return ret;
};

shinout

var values = [
  123, // int
  "string", // short string
  true, // boolean
  42.195, // float
  "AAAAAABBCCCCCCDDDDDDDDEEEEEEEAAAAAAAAAAAAA", // string
  null
];

function passObjByValue(N, nkey, keylen) {

shinout

LineStream.js

[Node.js] ReadableStream of lines

Installation

$ npm install linestream

OR

shinout

var fs = require('fs');
var filename = process.argv[2];
fs.open(filename, 'r', function(err, fd) {
  fs.watchFile(filename, function(cstat, pstat) {
    var delta = cstat.size - pstat.size;
    if (delta <= 0) return;

    fs.read(fd, new Buffer(delta), 0, delta, pstat.size, function(err, bytes, buffer) {
      console.log("err", err, "delta", delta, "bytes", bytes, "buffer", buffer.toString());
    });

shinout

var crypto = require('crypto');
var md5sum = crypto.createHash('md5');
md5sum.update('shinout', 'utf8');
console.log(md5sum.digest('hex'));

shinout

/**
 * 半角カナを全角カナに変換する
 * 半角スペースは変換しない
 * 対応がとれない濁点、半濁点は変換しない
 */
function toKanaZenkaku(str) {
  // lengthの等しい2つの文字列でkey-valueをつくる
  const makeMap = (str1, str2) =>
    str1
      .split("")