add strict mode to captcha

README.md

@@ -1,4 +1,4 @@
-# MLP character recognition
+# OCR
 
 Trains a multi-layer perceptron (MLP) neural network to perform optical character recognition (OCR).
 

captcha.js

@@ -1,6 +1,8 @@
-(function() {
+(function () {
+ 'use strict';
+
  var canvas = require('canvas');
- 
+
  function generate(config, callback) {
  config.size = config.size || 4;
  config.height = config.height || 24;
@@ -10,7 +12,7 @@
  config.text = config.text || ('' + Math.random()).substr(2, config.size);
  config.distortion = config.distortion === undefined ? true : config.distortion;
 
- var size = Math.round(config.height * .7),
+ var size = Math.round(config.height * 0.7),
  c = new canvas(config.width, config.height),
  context = c.getContext('2d'),
  fonts = config.fonts || ['sans-serif', 'serif'],
@@ -19,10 +21,10 @@
  context.fillStyle = config.background;
  context.fillRect(0, 0, config.width, config.height);
  context.fillStyle = config.color;
- 
+
  for(i = 0; i < config.text.length; i++) {
  context.font = size + 'px ' + fonts[Math.floor(Math.random() * fonts.length)];
- 
+
  if(config.distortion) {
  context.setTransform(
  Math.random() * 0.25 + 1, // scale horizontally
@@ -42,17 +44,17 @@
  config.height - size / 2 // move vertically
  );
  }
- 
+
  context.fillText(config.text.charAt(i), 0, 0);
  }
 
  c.toBuffer(function(error, buffer) {
  if(error)
  throw error;
- 
+
  callback(config.text, buffer);
  });
  }
 
  module.exports.generate = generate;
-})();
+})();