.set is not a function on map code example

Example 1: map add key to object in array javascript

const newArr = [
  {name: 'eve'},
  {name: 'john'},
  {name: 'jane'}
].map(v => ({...v, isActive: true}))

Example 2: map object and add new property javascript

Results.map(obj=> ({ ...obj, Active: 'false' }))