Using es6 spread to concat multiple arrays
Another option could be:
const nArrays = [
[1, 2, 3, 4, 5],
[6, 7, 8, 9],
[10, 11]
];
const flattened = [].concat(...nArrays);
console.log(flattened)
One option is to use reduce
:
let arrs = [[1, 2], [3, 4], [5, 6]];
arrs.reduce((a, b) => [...a, ...b], []);
Of course, this is a slow solution (quadratic time). Alternatively, if you can use Lodash, _.flatten
does exactly what you want, and does it more efficiently (linear time).
EDIT
Or, adapted from Xotic750's comment below,
[].concat(...arrs);
Which should be efficient (linear time).