how to store foreach value in array in javascript code example

Example 1: javascript foreach example

var colors = ["red", "blue", "green"];
colors.forEach(function(color) {
    console.log(color);
});

Example 2: store value in array from foreach loop

$items = array();
foreach($group_membership as $username) {
 $items[] = $username;
}

print_r($items);