javascript - Reactjs adding an object to state -

i'm using reactjs populate state.users new member when or signs in.

the following code working

var users = this.state.users; users.push(member); this.setstate({users: users}); 

but when try wrap in 1 line of code fails

this.setstate({users: this.users.state.push(member)}); 

when try above error further down in list.jsx

uncaught typeerror: this.props.users.map not function

any idea causing this? i'm thinking when use 1 line solution wrong kind of object passed state?

thank you!

it happens because .push returns new length (int number), not array,

var data = {      users: []  };    data.users = data.users.push(10);  console.log(typeof data.users); // number

.push - return new length property of object upon method called.

you can use .concat instead of .push

this.setstate({    users: this.state.users.concat(member) }); 

or

this.setstate({   users: [...this.state.users, member] });