declare type MyParameterType = {namedParameter: number};
const myArray: MyParameterType[] = [
  {namedParameter: 1},
  {namedParameter: 4},
];
function foo(): number[] {
  return myArray.map(({namedParameter}: MyParameterType) => {
    const asdf = Math.pow(namedParameter, 2) - 1;
    return asdf * 10;
  }));
}
function bar(): number[] {
  return myArray.map((params: MyParameterType) => {
    const asdf = Math.pow(params.namedParameter, 2) - 1;
    return asdf * 10;
  });
}
console.log(foo());
console.log(bar());