setState is not updating state properly

Question

Sorry, I really miss something with the transmission of state within props of sub components in React.

I have implemented a version of a todo l

Answer 1

As the other answers stated, the Array push method does not return the array. Just to complement the answers above, if you are using ES6, a nice and elegant way of doing this is using the spread operator (you can read more about it here)

this.setState({
    tasks: [...this.state.tasks, task]
})

It is essentially the same as using the concat method, but I think this has a nicer readability.