Start data from localStorage not working

[Francisco Javier Romero Conde]

When component is initialize, data from localStorage is not reading:

See your example:
https://stackblitz.com/edit/react-vbrkjb?embed=1&file=index.js

[Amit Solanki]

Late reply, but it seems that the typeof getNum === 'number' is false on the first run. Seems like there is some in consistency on how the data is converted.