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

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

nblackburn

const PERMISSION_WRITE = 'clipboard-write';

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

nblackburn

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

nblackburn

Password Entropy

Calculate the entropy of a password.

Usage

const passEnt = require('passEnt');

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

nblackburn

module.exports = (data, size = 10) => {
    let chunk = [];
    
    return data.reduce((chunks, item, index) => {
        chunk.push(item);
        
        if (chunk.length >= size || index === data.length - 1) {
            chunks.push(chunk);
            chunk = [];
        }

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

Recursively clone an object.

Usage

const obj = {
    foo: 'bar'
}

cloneObj(obj);

nblackburn

Group By

Group items by the key returned in the callback.

const data = [
    { id: 'a' },
    { id: 'b' },
    { id: 'a' }
];

nblackburn

export const encodeQueryString = (params) => {
    const keys = Object.keys(params);
    const encode = (param) => {
        const value = params[param];
        const pair = [param];

        if (value) {
            pair.push(value);
        }