Trouble understanding JSX spread operator [duplicate]

Question

Given this example code from the React docs:

var props = {}; props.foo = x; props.bar = y; var component = <Component {...props} />; 

I did some looking into what ...props actually evaluates to, which is this:

React.__spread({}, props) 

Which in turn evaluates to {foo: x, bar: y}.

But what I'm wondering is, why can't I just do this:

var component = <Component props />; 

I don't see understand what the point of the spread operator is.

Answer 1

This helps make your code more succinct - since props is an object, the spread operator takes the properties of the object you pass in and applied them to the component. So the Component will have properties a foo with a value of x and a bar with a value of y.

It would be the same as:

var component = <Component foo={props.foo} bar={props.bar} />; 

just shorter