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I am working on a React frontend with a delete method which deletes an item in the database. Having a hard time with the following code.

deleteFromDB = idTodelete => { let objIdToDelete = null; this.state.data.forEach(dat => { if (dat.id == idTodelete) { objIdToDelete = dat._id; } });

This is the method called after entering the ID to be deleted and this modifies the state by deleting the item corresponding to the ID

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  • This could be a typo, but maybe the objects in your state have two ID attributes. id might be a 'frontend' ID whereas _id is the ID used in the database. Commented May 10, 2019 at 9:42
  • Possible duplicate of What is the underscore "_" in JavaScript? Commented May 10, 2019 at 9:56

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It's a naming convention for private variables and methods used by some developers to indicate that they are private.

Also see: What is the underscore "_" in JavaScript?

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It may be possible that _id is actually the primary key of the data you want to delete, as it is actually used in mongodb

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