The Array filter() method creates a new array filled with elements that pass a test provided by a function, leaving the existing array unchanged.

<!-- html element to place output -->
<p id="my_ages"></p>

// array
let ages = [9, 23, 33, 43];

// function to run
function check_ages(age) {
    return age >= 18;
}

// new filtered array
let results = ages.filter(check_ages);

// output all ages equal to or greater than 18 to the HTML element
document.getElementById('my_ages').innerHTML = results;

The way this works (see Syntax section below):

• The filter() method cycles through the array looking for ages greater than or equal to 18 and creates a new array with those items

23,33,43

array.filter(function(currentValue, index, arr), thisValue)

Parameter	Description
function()	A function to be run for each element in the array (required)
currentValue	The value of the current element (required)
index	The index of the current element
arr	The array of the current element
thisValue	A value passed to the function as its "this" value (default is undefined)

---