Q:

Filter an array of objects and extract its property by using an array of keys

im having this problem which i cant wrap around my head,
much better if put in a code. 
//Array of objects sample
var objects = [{id:1, name:'test1'}, {id:2, name:'test2'}, {id:3, name: 'test3'}, {id:4, name:'test4'}];
var arrayOfKeys = [3,1,4];

//extract object name property if its id property is equivalent to one of arrayOfKeys [3,1] 
//var arrayOfKeys = [3,1,4];
//output sample: extractedName=['test3','test1','test4'];

i've been using filter and map but no avail, also tried nesting filter inside map im getting an arrays of array and inside is a single object. 

A:

You could map the objects and ren map the wanted keys for getting the name. 

var objects = [{ id: 1, name: 'test1' }, { id: 2, name: 'test2' }, { id: 3, name: 'test3' }],
    arrayOfKeys = [3, 1],
    result = arrayOfKeys.map((map => id => map.get(id).name)(new Map(objects.map(o => [o.id, o]))));
    
console.log(result);

