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array.flat

Dexter Whelan 
// 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]
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3.88
8
Koji 90 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;];

3.88 (8 Votes)
0
3.86
7
Kelly Hess 130 points 

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

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

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

3.86 (7 Votes)
0
4
3
Nitro2k01 115 points 

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

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

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

4 (3 Votes)
0
3.9
10
Glenna Peach 75 points 

                                    const arrays = [
      [&quot;$6&quot;],
      [&quot;$12&quot;],
      [&quot;$25&quot;],
      [&quot;$25&quot;],
      [&quot;$18&quot;],
      [&quot;$22&quot;],
      [&quot;$10&quot;]
    ];
const merge3 = arrays.flat(1); //The depth level specifying how deep a nested array structure should be flattened. Defaults to 1.
console.log(merge3);

3.9 (10 Votes)
0
3
3
NaaN 80 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 (3 Votes)
0
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