// With simple values
var percentile = require('percentile');
console.log(percentile(80, [1, 2, 3, 4, 5, 6, 7, 8, 9, 10])); // 8

// With complex values
var percentile = require('percentile');
var result = percentile(
    80,
    [
        { val: 1 }, { val: 2 }, { val: 3 }, { val: 4 }, { val: 5 },
        { val: 6 }, { val: 7 }, { val: 8 }, { val: 9 }, { val: 10 }
    ],
    function (item) { // function to extract value from object
        return item.val;
    }
);
console.log(result); // 8