Lodash schortcuts in typescript

utilities.ts

interface User {
  firstName:string;
  lastName:string;
  age:number;
}

const user1= {firstName:"Georges",lastName:"Abitbol", age:43}
const user2 = { firstName: "Joel", lastName: "Hammond", age: 25 }
const arr: Array<User> = [user1, user2]


function pluck<A, P extends (keyof A)>(array: Array<A>, p: P): Array<A[P]> {
    return array.map(a => a[p]);
}

//equivalent to _.map(arr, 'firstName')
const names:Array<string> = pluck(arr, 'firstName');


function filter<A, P extends (keyof A)>(array: Array<A>, predicate:{[K in P]:A[P]}): Array<A> {
  return array.filter(a => {    
    for (let p in predicate) {
      if (a[p] !== predicate[p]) {
          return false;
        }
    }

    return true;
  });
}

filter(arr, { firstName: 'Georges' });
  
function find<A, P extends (keyof A)>(array: Array<A>, predicate: {[K in P]: A[P]}): A {
  return array.find(a => {    
    for (let p in predicate) {
      if (a[p] !== predicate[p]) {
        return false;
        }
    }

    return true;
  });
}

find(arr, { firstName: 'Georges' });