thisjsonDatamapitem = itemname itemlevel itemstreet itemarea

It seems like you are trying to map an array of objects called 'jsonData' and extract specific properties from each object. However, the code snippet you provided is missing the assignment or usage of the mapped result.

To correctly map the 'jsonData' array and extract the desired properties (name, level, street, area), you can use the following code:

const mappedData = this.jsonData.map(item => [item.name, item.level, item.street, item.area]);

This will create a new array called 'mappedData' that contains arrays for each object in 'jsonData', with the desired properties extracted