Function to get array with only unique elements

getUniqueArray

function getUnique(array) {
    const u = {};
    const a = [];
    for (let i = 0, l = array.length; i < l; ++i) {
        if (u.hasOwnProperty(array[i])) {
            continue;
        }
        a.push(array[i]);
        u[array[i]] = 1;
    }
    return a;
}