javascript distinct object array code example

Example 1: javascript map return array with distinc values

//ES6
let array = [
  { "name": "Joe", "age": 17 },
  { "name": "Bob", "age": 17 },
  { "name": "Carl", "age": 35 }
];
array.map(item => item.age)
  .filter((value, index, self) => self.indexOf(value) === index)

> [17, 35]

Example 2: javascript get unique values from key

const unique = [...new Set(array.map(item => item.age))];

Example 3: Return Distinct Array Object

const array = [    { id: 3, name: 'Central Microscopy', fiscalYear: 2018 },    { id: 5, name: 'Crystallography Facility', fiscalYear: 2018 },    { id: 3, name: 'Central Microscopy', fiscalYear: 2017 },    { id: 5, name: 'Crystallography Facility', fiscalYear: 2017 }  ];const result = [];const map = new Map();for (const item of array) {    if(!map.has(item.id)){        map.set(item.id, true);    // set any value to Map        result.push({            id: item.id,            name: item.name        });    }}console.log(result)