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This is an ECMAScript 6 solution using spread operator and array generics.

Currently it only works with Firefox, and possibly Internet Explorer Technical Preview.

But if you use Babel, you can have it now.

// Input: [ [1, 2, 3], [101, 2, 1, 10], [2, 1] ]
// Output: [1, 2, 3, 101, 10]
function mergeDedupe(arr)
{
  return [...new Set([].concat(...arr))];
}

This is an ECMAScript 6 solution using spread operator and array generics.

Currently it only works with Firefox, and possibly Internet Explorer Technical Preview.

But if you use Babel, you can have it now.

const input = [
  [1, 2, 3],
  [101, 2, 1, 10],
  [2, 1]
];
const mergeDedupe = (arr) => {
  return [...new Set([].concat(...arr))];
}

console.log('output', mergeDedupe(input));

es6 solution using spread operator and array generics.
Currently only works with Firefox, and possibly IE Technical Preview. But if you use Babel, you can have it now.

// Input: [ [1, 2, 3], [101, 2, 1, 10], [2, 1] ]
// Output: [1, 2, 3, 101, 10]
function mergeDedupe( arr )
{
  return [ ...new Set( [].concat( ...arr ) ) ];
}

This is an ECMAScript 6 solution using spread operator and array generics.

Currently it only works with Firefox, and possibly Internet Explorer Technical Preview.

But if you use Babel, you can have it now.

// Input: [ [1, 2, 3], [101, 2, 1, 10], [2, 1] ]
// Output: [1, 2, 3, 101, 10]
function mergeDedupe(arr)
{
  return [...new Set([].concat(...arr))];
}

es6 solution using spread operator and array generics.
Currently only works with Firefox, and possibly IE Technical Preview.

// Input: [ [1, 2, 3], [101, 2, 1, 10], [2, 1] ]
// Output: [1, 2, 3, 101, 10]
function mergeDedupe( arr )
{
  return [ ...new Set( Array.concat( ...arr ) ) ];
}

es6 solution using spread operator and array generics.
Currently only works with Firefox, and possibly IE Technical Preview. But if you use Babel, you can have it now.

// Input: [ [1, 2, 3], [101, 2, 1, 10], [2, 1] ]
// Output: [1, 2, 3, 101, 10]
function mergeDedupe( arr )
{
  return [ ...new Set( [].concat( ...arr ) ) ];
}