Pick data from array of objects and return new object

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This really is a simple one liner via map and delete or map and ES6 destructuring as shown in the 2 examples bellow:

var data = [{
    "first": "Linda",
    "last": "Donson",
    "salary": "4000USD"
  },
  {
    "first": "Mark",
    "last": "Sullivan",
    "salary": "3500USD"
  }
]

console.log(data.map(x => delete(x.salary) && x))

Also if you are concerned about mutating the object you can simply use ES6 destructuring and the short object literal notation to get this:

Object.values(data).map(({first, last})  => ({first, last}))

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