Create new array with two columns from old array

Question

I have an array as follows:

items = [
{"year": 2010, "month": 11, "day":23}
{"year": 2009, "month": 10, "day":15}
{"year": 2009, "month": 10, "day":10} //added after my edit below
]

I would like to create a new array with only 2 of the columns like this:

newArarry = [
{"year": 2010, "month": 11}
{"year": 2009, "month": 10}
]

Right now Im trying with .map() and its not working:

const newArray = [];
newArray.map({
    year: items.year,
    month: items.month
});

EDIT

After following one of the answers below, I realized I forgot to mention that I would also need to filter the result to be only unique rows. Now that I am only selecting the year and month columns, I am getting multiple duplicate rows

Answer 1

Array's .map() method accepts a callback whose returned value will be used to construct new array. Mistakenly you are passing it an object instead of a function. To fix this you can use .map() with some Object Destructuring:

const items = [
  {"year": 2010, "month": 11, "day":23},
  {"year": 2009, "month": 10, "day":15}
];

const result = items.map(({ year, month }) => ({year, month}));

console.log(result);

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