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JavaScript React Components (2018) Managing State and Data Flow Managing State Review

cathymacars
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cathymacars
Full Stack JavaScript Techdegree Student 15,941 Points
Posted by cathymacars
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cathymacars
Full Stack JavaScript Techdegree Student 15,941 Points

What's wrong with my answer?

The quiz asks me to "Complete the code to bring in all student objects in the previous state into the students array in setState().".

My answer was ...this.state.students.

Thanks

1 Answer

Brendan Whiting
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Brendan Whiting
Front End Web Development Techdegree Graduate 84,735 Points
Brendan Whiting
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Brendan Whiting
Front End Web Development Techdegree Graduate 84,735 Points

It should be ...prevState.students

We're passing in a callback to setState here as opposed to an object. This is the strategy that let's use make sure that we avoid any bugs with state being set asynchronously. The parameter here was named prevState, so we should use that as opposed to directly accessing the state object.

Ashton Little
Ashton Little
1,861 Points

this is wrong it should be ...prevState

Alvaro Roa
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Alvaro Roa
Full Stack JavaScript Techdegree Student 7,510 Points

Wrong! ...prevState