select distinct values from js object array code example

Example 1: javascript get distinct values from array

const categories = ['General', 'Exotic', 'Extreme', 'Extreme', 'General' ,'Water', 'Extreme']
.filter((value, index, categoryArray) => categoryArray.indexOf(value) === index);

This will return an array that has the unique category names
['General', 'Exotic', 'Extreme', 'Water']

Example 2: 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)