array_filter_function

const nums = [23, 45, 3, 2, 6, 7, 8, 8, 90, 87, 65, 4, 3, 2];//test data
const line = () => {
    console.log('-'.repeat(50))
};//print pseudo line
const times = 1000000;//repeating cycle

//========================================
//high order function filter()
console.time('high order function: filter()');

for (let indx = 0; indx < times; indx += 1) {
    const filtered = nums.filter((a) => a >= 21);
}

console.timeEnd('high order function: filter()');

line();
//========================================

//naive approach
console.time('naive approach');
for (let indx = 0; indx < times; indx += 1) {
    const filtered = [];
    for (let e = 0; e < nums.length; e += 1) {
        if (e >= 21) {
            filtered.push(e);
        }
    }
}
console.timeEnd('naive approach')
line();