function diff(arr, arrays) {
  var argsLen = arguments.length;
  var len = arr.length,
      i = -1;
  var res = [],
      arrays;

  if (argsLen === 1) {
    return arr;
  }

  if (argsLen > 2) {
    arrays = flatten(slice.call(arguments, 1));
  }

  while (++i < len) {
    if (!~arrays.indexOf(arr[i])) {
      res.push(arr[i]);
    }
  }

  return res;
}
Return the difference between the first array and
additional arrays.

```js
var diff = require('{%= name %}');

var a = ['a', 'b', 'c', 'd'];
var b = ['b', 'c'];

console.log(diff(a, b))
//=> ['a', 'd']
```

@param  {Array} `a`
@param  {Array} `b`
@return {Array}
@api public