Let’s say, we have an array of arrays of Numbers like below −
const arr = [ [1, 16, 34, 48], [6, 66, 2, 98], [43, 8, 65, 43], [32, 98, 76, 83], [65, 89, 32, 4], ];
We are required to write a function that maps over this array of arrays and returns an array that contains the maximum (greatest) element from each subarray.
So, for the above array, the output should be −
const output = [ 48, 98, 65, 83, 89 ];
Example
Following is the code to get the greatest element from each subarray −
const arr = [
[1, 16, 34, 48],
[6, 66, 2, 98],
[43, 8, 65, 43],
[32, 98, 76, 83],
[65, 89, 32, 4],
];
const constructBig = arr => {
return arr.map(sub => {
const max = Math.max(...sub);
return max;
});
};
console.log(constructBig(arr));Output
This will produce the following output in console −
[ 48, 98, 65, 98, 89 ]