I am working with an array of numbers that is structured like this:
const arrayOfArrays: number[][] = [[1, 2], [1, 3]];The desired outcome is to have [[1, 2], [2, 1], [1, 3], [3, 1]].
I found a solution using the following approach:
// initialize an empty array
let result: number[][] = [];
for (const elArr of arrayOfArrays) {
result.push(elArr);
result.push(elArr.reverse());
}
However, I believe there might be more elegant ways to achieve this. Any suggestions?
To achieve this, you can utilize the Array#flatMap method to obtain the desired outcome within a single iteration.
var matrix = [[1, 2], [1, 3]],
output = matrix.flatMap(([...data]) => [[...data], data.reverse()]);
console.log(output);Although your solution is clever, I decided to try a different approach:
let array = [[1, 2], [1, 3]];
let transformedArray = array.map((value, index) => {
return [value, array[index].slice().reverse()];
}).flat();
Keep in mind that Array.flat() is a new feature, so feel free to refer to the ES specification here
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