Method randomArray

function/magic.js:803–814

(arr, count)

    }

    randomArray(arr, count) {
        count = count || arr.length
        let shuffled = arr.slice(0), i = arr.length, min = i - count, temp,
            index;
        while (i-- > min) {
            index = Math.floor((i + 1) * Math.random());
            temp = shuffled[index];
            shuffled[index] = shuffled[i];
            shuffled[i] = temp;
        }
        return shuffled.slice(min);
    }

    now(fmt) {
        return format(Date.now(), fmt || 'yyyy-MM-dd HH:mm:ss.SSS')