nblackburn

Recursively clone an object.

Usage

const obj = {
    foo: 'bar'
}

cloneObj(obj);

nblackburn

Checks if a given word is a palindrome.

Usage

const tests = ['hannah', 'anna', 'kayak', 'apple', 'mom', 'wow', 'rotator', 'radar']

tests.forEach((test) => {
    console.log('IS_PALINDROME', test, isPalindrome(test));
});

nblackburn

module.exports = (data, limit = 10) => {
    let chunk = -1;
    let chunks = [];

    for (let index = 0; index < data.length; index++) {
        if (index % limit === 0) {
            chunk += 1;
            chunks.push([]);
        }

nblackburn

Password Entropy

Calculate the entropy of a password.

Usage

const passEnt = require('passEnt');

const H = passEnt('pswd'); // 18.801758872564367

nblackburn

module.exports = (value) => {
	return value && typeof value.then === 'function' && typeof value.catch === 'function';
};

nblackburn

const PERMISSION_WRITE = 'clipboard-write';

const canUseAsyncAPI = () => {
    return (
        navigator.clipboard &&
        navigator.clipboard.writeText &&
        navigator.permissions &&
        navigator.permissions.request
    );
};

nblackburn

module.exports = (foreground, background) => {
    const l1 = Math.max(foreground, background);
    const l2 = Math.min(foreground, background);

    return (l1 + 0.05) / (l2 + 0.05);
};

nblackburn

module.exports = (red, green, blue) => {
    const rs = red / 255;
    const gs = green / 255;
    const bs = blue / 255;

    const rn = rs <= 0.03928 ? rs / 12.92 : Math.pow((rs + 0.055) / 1.055, 2.4);
    const gn = gs <= 0.03928 ? gs / 12.92 : Math.pow((gs + 0.055) / 1.055, 2.4);
    const bn = bs <= 0.03928 ? bs / 12.92 : Math.pow((bs + 0.055) / 1.055, 2.4);

    return (0.2126 * rn) + (0.7152 * gn) + (0.0722 * bn);

nblackburn

module.exports = hex => {
    if (hex.charAt(0) === '#') {
        hex = hex.substring(1);
    }

    if (hex.length !== 3 && hex.length !== 6) {
        return false;
    }

    if (hex.length === 3) {

nblackburn

module.exports = (red, green, blue, preferShorthand = false) => {
    let colours = [red, green, blue].map(value => value.toString(16));
    let canBeCondensed = colours.every(value => value.charAt(0) === value.charAt(1));

    if (canBeCondensed && preferShorthand) {
        colours = colours.map(v => v.charAt(0));
    }
    
    return '#' + colours.join('');
};