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flatten nested array javascript

John 
// using recursion, .reduce() and .concat() methods
// works with arrays of any depth

function flatten(arr)
{
	return arr.reduce((acc, cur) => acc.concat(Array.isArray(cur) ? flatten(cur) : cur), []);
};

const arr = [[1,2],[3,[4,[5]]]];

const flattened = flatten(arr);
console.log(flattened);

/*
	Output: [ 1, 2, 3, 4, 5 ]
*/
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3.67
3
DaGrimReaper2002 110 points 

                                    var multiDimensionArray = [[&quot;a&quot;],[&quot;b&quot;,&quot;c&quot;],[&quot;d&quot;]]; //array of arrays<br/>var flatArray = Array.prototype.concat.apply([], multiDimensionArray); //flatten array of arrays<br/>console.log(flatArray); // [ &quot;a&quot;,&quot;b&quot;,&quot;c&quot;,&quot;d&quot;];

3.67 (3 Votes)
0
4.67
7
Knmanish 115 points 

                                    const arr2 = [1, 2, [3, 4, [5, 6]]];
arr2.flat();

4.67 (6 Votes)
0
4.5
4
Rockhorse Park 85 points 

                                    // flat(depth), 
// depth is optional: how deep a nested array structure 
//		should be flattened.
//		default value of depth is 1 

const arr1 = [1, 2, [3, 4]];
arr1.flat(); 
// [1, 2, 3, 4]

const arr2 = [1, 2, [3, 4, [5, 6]]];
arr2.flat();
// [1, 2, 3, 4, [5, 6]]

const arr3 = [1, 2, [3, 4, [5, 6]]];
arr3.flat(2);
// [1, 2, 3, 4, 5, 6]

const arr4 = [1, 2, [3, 4, [5, 6, [7, 8, [9, 10]]]]];
arr4.flat(Infinity);
// [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]

4.5 (4 Votes)
0
4.17
6
Anton Wishik 100 points 

                                    var arrays = [
  [&quot;$6&quot;],
  [&quot;$12&quot;],
  [&quot;$25&quot;],
  [&quot;$25&quot;],
  [&quot;$18&quot;],
  [&quot;$22&quot;],
  [&quot;$10&quot;]
];
var merged = [].concat.apply([], arrays);

console.log(merged);

4.17 (6 Votes)
0
3.75
4
Llaves 75 points 

                                    const arr = [1, 2, [3, 4]];

// To flat single level array
arr.flat();
// is equivalent to
arr.reduce((acc, val) =&gt; acc.concat(val), []);
// [1, 2, 3, 4]

// or with decomposition syntax
const flattened = arr =&gt; [].concat(...arr);

3.75 (4 Votes)
0
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