lodash uniqBy alterantive in js
const uniqBy = (arr, predicate) => {
const cb = typeof predicate === 'function' ? predicate : (o) => o[predicate];
return [...arr.reduce((map, item) => {
const key = (item === null || item === undefined) ?
item : cb(item);
map.has(key) || map.set(key, item);
return map;
}, new Map()).values()];
};
const sourceArray = [
{ id: 1, name: 'bob' },
{ id: 1, name: 'bill' },
null,
{ id: 1, name: 'bill' } ,
{ id: 2,name: 'silly'},
{ id: 2,name: 'billy'},
null,
undefined
];
console.log('id string: ', uniqBy(sourceArray, 'id'));
console.log('name func: ', uniqBy(sourceArray, (o) => o.name));