Storing and getting boolean with Redis

Question

I'm trying to use Redis to store and get a boolean for my toggle function.

The dependecy what I'm using is redis-js I can set the value false with key to redis but getting the valu from redis is always false.

Say first store the key value to Redis

redis.set('myKey', 'false');

Get the value

let toggle = redis.get('myKey');
toggle = !toggle;

Store

redis.set('myKey', toggle);

Get

const checkStatus = redis.get('myKey');
return checkStatus;

I'm expecting the output will be true -> false if executed the function two times.

Answer 1

For your toogle to work you've to explicitly check if the value you get is equal to the string 'false'.

let toggle = redis.get('myKey');
toggle = toogle === 'false'

Converting the string 'false' to boolean results to true not false and negating it you get false.

From MDN

All other values, including any object or the string "false", create an object with an initial value of true

Here's an illustration:

const val = 'false'

const toggle = !val; // this is equivalent to !Boolean(val)

const bool = Boolean(val) // get boolean
const negated = !bool // negate
console.log('toggle: ', toggle);
console.log('bool: ', bool); // Boolean("false") gives true
console.log('negated: ', negated);