We are required to write a JavaScript function that takes in an array of numbers representing ages of some people.
Then the function should bring all the ages less than 18 to the front of the array without using any extra memory.
Example
The code for this will be −
const ages = [23, 56, 56, 3, 67, 8, 4, 34, 23, 12, 67, 16, 47];
const sorter = (a, b) => {
if (a < 18) {
return -1;
};
if (b < 18) {
return 1;
};
return 0;
}
const sortByAdults = arr => {
arr.sort(sorter);
};
sortByAdults(ages);
console.log(ages);Output
The output in the console −
[ 16, 12, 4, 8, 3, 23, 56, 56, 67, 34, 23, 67, 47 ]