D3 Examples - JS Bin // source http://jsbin.com/duwocuhama

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<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <title>JS Bin</title>
</head>
<body>
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<script id="jsbin-javascript">
var mapRange = function(val, inputStart, inputEnd, outputStart, outputEnd) {
  var slope = (outputEnd - outputStart) / (inputEnd - inputStart);
  return outputStart + slope * (val - inputStart);
};
​
console.log(mapRange(255, 0, 255, 0, 1));
</script>
​
​
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<script id="jsbin-source-javascript" type="text/javascript">var mapRange = function(val, inputStart, inputEnd, outputStart, outputEnd) {
  var slope = (outputEnd - outputStart) / (inputEnd - inputStart);
  return outputStart + slope * (val - inputStart);
};
​
console.log(mapRange(255, 0, 255, 0, 1));</script></body>
</html>
    