Within my matrix are arrays of rows.
let matrix=[['hello'],['world']];
I am looking to duplicate each row within the matrix.
matrix=matrix.map(x=>String(x).repeat(2)).map(x=>x.match(new RegExp??))
The desired outcome should be
[['hello','hello'],['world','world']]
To replicate the arrays, utilize the concat function
const matrix = [
['goodbye'],
['universe']
];
const result = matrix.map(arr => arr.concat(arr))
console.log(result);Alternatively, if you have an array of arrays and wish to obtain multiple entries instead of just one:
const matrix = [
['goodbye'],
['universe']
];
const result = matrix.map(arr => Array(3).fill(...arr));
console.log(result);Your current code approach will not work for a few reasons. Firstly, there is no method called Array::repeat(). Secondly, it does not make sense to duplicate an array using the RegExp::match() method. Lastly, you are attempting to assign a value to a constant variable which is not allowed. It would be more efficient to use simpler techniques.
If you want to duplicate the original array, you can simply mutate it like this:
const matrix = [
['hello'],
['world']
];
// Push each array into itself to duplicate
matrix.forEach(arr => arr.push(...arr));
console.log(matrix);This method is definitely faster than overwriting the array with a new one. You can see the comparison in the image below:
https://i.sstatic.net/qAtnH.png
<script benchmark data-count="5000000">
// @benchmark The fourth bird
{
let matrix = [
['hello'],
['world']
];
matrix = matrix.map(a => a.concat(a))
}
// @benchmark Alexander
{
const matrix = [
['hello'],
['world']
];
matrix.forEach(arr => arr.push(...arr));
matrix;
}
</script>
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