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JavaScript React by Example Building the Application Toggling Edit State for Guests

Posted by Hjalti Agustsson
Hjalti Agustsson
3,846 Points

TypeError: _this.state is not a function ?

App._this.toggleGuestPropertyAt

24 | ] 25 | } 26 |

27 | toggleGuestPropertyAt = (property, indexToChange) => 28 | this.state({ 29 | guests: this.state.guests.map((guest, index) => { 30 | if (index === indexToChange) {

toggleGuestPropertyAt = (property, indexToChange) => this.state({ guests: this.state.guests.map((guest, index) => { if (index === indexToChange) { return { ...guest, [property]: !guest[property] }; } return guest; }) });

toggleConfirmationAt = index => this.toggleGuestPropertyAt("isConfirmed", index);

handleConfirmation={() => props.toggleConfirmationAt(index)}

I got this error when when changing my function to use property. This happens when clicking checkbox also when clicking editing button just the different function toggleEditingAt When I searched on the internet for this error it gave me answers about how to bind this. Which I am not sure about, what do you think guys?

Jason Welsh
.a{fill-rule:evenodd;}techdegree seal-36
Jason Welsh
Treehouse Project Reviewer

Hi, so state is not a function, but rather an object we use to hold the current state of a component. setState() is a function we use to change the state of the state object. It takes two arguments - the first is an object that we will merge with state, and the second is a callback that is basically never used.

So in this case you have this.state instead of this.setState. You need to update the state object with the setState function.

Hope that helps :)