vasanthv

Quacku Docs

Quacku is a status only app, which lets you answer "What are you doing right now?".

It lets you automate your status by calling Quacku webhook URLs from any app. This way you can post automatic statuses to Quacku when you are doing certain activities in other apps, like posting a blog.

Your unique webhook url will be in the below format:

https://quacku.com/webhook/{WEBHOOK_KEY}

vasanthv

String.prototype.mySubstring = function(start, end) {
	let substr = '';
	for (i = (start || 0); i <= ((end || this.length) - 1); i++) {
		substr += this[i];
	}
	return substr;
}


console.log("hello world!".mySubstring(1, 5)); // => ello

vasanthv

function isPrime(num) {
	if (num > 2 && num % 2 === 0) return false;
	for (var i = 3; i < Math.sqrt(num); i += 2) {
		if (num % i === 0) return false;
	}
	return num > 1;
}

vasanthv

const arr = [ [ '8', '0', '5', '7', '9' ], [ '1', '2', '4' ] ]

const output = arr.reduce((a, b) => {
	let ret = [];
	a.forEach(i => b.forEach(j => ret.push(i + j)));
	return ret;
});

// output = [ '81', '82', '84', '01', '02', '04', '51', '52', '54', '71', '72', '74', '91', '92', '94' ];

vasanthv

const factorial = (n) => (Array.from(Array(n), (_, i) => i + 1)).reduce((a, b) => a * b);

vasanthv

//Based on https://stackoverflow.com/a/42531964

function combinations(array, length) {
    const arr = new Array(1 << array.length).fill().map(
        (e1, i) => array.filter((e2, j) => i & 1 << j));
    return length ? arr.filter(a => a.length == length) : arr;
}

//console.log(combinations([1, 2, 3, 8, 10], 2));

vasanthv

const random = (i,j) => (Math.floor(Math.random() * (j - i)) + i);

vasanthv

function formatDate(dateString){
    const date = new Date(dateString);
    const hours = date.getHours() > 12 ? date.getHours() - 12 : date.getHours();
    return [ "Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec" ][date.getMonth()] + ' '
        + (date.getDate() < 10 ? '0' + date.getDate() : date.getDate()) + ' '
        + date.getFullYear() + ' - '
        + (hours < 10 ? '0' + hours : hours) + ':'
        + (date.getMinutes() < 10 ? '0' + date.getMinutes() : date.getMinutes()) + ' '
        + (date.getHours() >= 12 ? 'PM' : 'AM');
}

vasanthv

//Based on https://stackoverflow.com/a/46880431/607608

function getComb(set, val) {
    const res = [];
    function comb(set, k, partial, pref) {
        if (!partial) partial = [];
        for (const element in set) {
            if (k > 1) {
                const set_copy = set.slice();
                set_copy.splice(element, 1);

vasanthv

function getRandom(arr, n) {
    var result = new Array(n),
        len = arr.length,
        taken = new Array(len);
    if (n > len)
        throw new RangeError("getRandom: more elements taken than available");
    while (n--) {
        var x = Math.floor(Math.random() * len);
        result[n] = arr[x in taken ? taken[x] : x];
        taken[x] = --len in taken ? taken[len] : len;