dist.js

'use strict';

var bytes = new Uint8Array([0x00, 0x61, 0x73, 0x6d, 0x01, 0x00, 0x00, 0x00, 0x01, 0x08, 0x01, 0x60, 0x03, 0x7f, 0x7f, 0x7f, 0x01, 0x7f, 0x03, 0x02, 0x01, 0x00, 0x05, 0x04, 0x01, 0x00, 0x80, 0x02, 0x07, 0x0d, 0x02, 0x03, 0x6d, 0x65, 0x6d, 0x02, 0x00, 0x03, 0x73, 0x61, 0x64, 0x00, 0x00, 0x0a, 0x86, 0x02, 0x01, 0x83, 0x02, 0x01, 0x04, 0x7f, 0x02, 0x7f, 0x20, 0x00, 0x20, 0x02, 0x6a, 0x22, 0x05, 0x20, 0x05, 0x41, 0x04, 0x70, 0x6b, 0x21, 0x06, 0x02, 0x40, 0x03, 0x40, 0x20, 0x00, 0x20, 0x06, 0x46, 0x0d, 0x01, 0x20, 0x04, 0x20, 0x00, 0x2d, 0x00, 0x00, 0x20, 0x01, 0x2d, 0x00, 0x00, 0x6b, 0x22, 0x02, 0x41, 0x1f, 0x75, 0x22, 0x03, 0x20, 0x02, 0x73, 0x20, 0x03, 0x6b, 0x6a, 0x20, 0x00, 0x41, 0x01, 0x6a, 0x22, 0x00, 0x2d, 0x00, 0x00, 0x20, 0x01, 0x41, 0x01, 0x6a, 0x22, 0x01, 0x2d, 0x00, 0x00, 0x6b, 0x22, 0x02, 0x41, 0x1f, 0x75, 0x22, 0x03, 0x20, 0x02, 0x73, 0x20, 0x03, 0x6b, 0x6a, 0x20, 0x00, 0x41, 0x01, 0x6a, 0x22, 0x00, 0x2d, 0x00, 0x00, 0x20, 0x01, 0x41, 0x01, 0x6a, 0x22, 0x01, 0x2d, 0x00, 0x00, 0x6b, 0x22, 0x02, 0x41, 0x1f, 0x75, 0x22, 0x03, 0x20, 0x02, 0x73, 0x20, 0x03, 0x6b, 0x6a, 0x21, 0x04, 0x20, 0x00, 0x41, 0x01, 0x6a, 0x22, 0x00, 0x2d, 0x00, 0x00, 0x20, 0x01, 0x41, 0x01, 0x6a, 0x22, 0x01, 0x2d, 0x00, 0x00, 0x6b, 0x22, 0x02, 0x41, 0x1f, 0x75, 0x22, 0x03, 0x20, 0x02, 0x73, 0x20, 0x03, 0x6b, 0x21, 0x02, 0x20, 0x00, 0x41, 0x01, 0x6a, 0x21, 0x00, 0x20, 0x01, 0x41, 0x01, 0x6a, 0x21, 0x01, 0x20, 0x04, 0x20, 0x02, 0x6a, 0x21, 0x04, 0x0c, 0x00, 0x0b, 0x00, 0x0b, 0x02, 0x40, 0x03, 0x40, 0x20, 0x00, 0x20, 0x05, 0x46, 0x0d, 0x01, 0x20, 0x00, 0x2d, 0x00, 0x00, 0x20, 0x01, 0x2d, 0x00, 0x00, 0x6b, 0x22, 0x02, 0x41, 0x1f, 0x75, 0x22, 0x03, 0x20, 0x02, 0x73, 0x20, 0x03, 0x6b, 0x21, 0x02, 0x20, 0x00, 0x41, 0x01, 0x6a, 0x21, 0x00, 0x20, 0x01, 0x41, 0x01, 0x6a, 0x21, 0x01, 0x20, 0x04, 0x20, 0x02, 0x6a, 0x21, 0x04, 0x0c, 0x00, 0x0b, 0x00, 0x0b, 0x20, 0x04, 0x0b, 0x0b]);

var wasmSad = null;

function jsSad(A, B) {
  var sum = 0;

  for (var i = 0; i < A.length; i += 1) {
    sum += Math.abs(A[i] - B[i]);
  }

  return sum;
}

if ('WebAssembly' in global) {
  var env = {
    memoryBase: 0,
    tableBase: 0,
    memory: new WebAssembly.Memory({ initial: 256 }),
    table: new WebAssembly.Table({ initial: 0, element: 'anyfunc' })
  };

  var _module = new WebAssembly.Module(bytes);
  var instance = new WebAssembly.Instance(_module, { env: env });
  var data = new Uint8ClampedArray(instance.exports.mem.buffer);

  wasmSad = function wasmSad(A, B) {
    var l = A.length;
    data.set(A, 0);
    data.set(B, l);
    return instance.exports.sad(0, l, l);
  };
}

module.exports = function (A, B) {
  var _ref = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : {},
      _ref$normalize = _ref.normalize,
      normalize = _ref$normalize === undefined ? false : _ref$normalize,
      _ref$useJS = _ref.useJS,
      useJS = _ref$useJS === undefined ? false : _ref$useJS;

  if (A.length !== B.length) {
    throw new Error('Arrays must be same dimension');
  }

  var diff = wasmSad === null || useJS ? jsSad(A, B) : wasmSad(A, B);

  if (normalize) {
    return diff / A.length;
  }

  return diff;
};