some method to check an array in JavaScript

The following method some checks the array elements and returns true if the callback returned true for at least one element, otherwise the method returns false .

Let's check, for example, that there is at least one even number in the array:

let arr = [2, 4, 6, 8];

let result = arr.some(function(elem) {
	return elem % 2 == 0;
});

console.log(result);

Let's simplify:

let arr = [2, 4, 6, 8];

let result = arr.some(elem => elem % 2 == 0);
console.log(result);

Given an array of numbers. Check that the array contains at least one number greater than zero.

Given an array of numbers. Check that for at least one element the product of its value and index number is greater than 30.