Linq implementation in ES6

linq.js

let linq = function*(array){
  for (let item of array){
    yield item;
  }
};

let where = function*(predicate){
  for(let item of this){
    if (predicate(item)) {
      yield item;
    }
  }
};

let select = function*(transform){
  for (let item of this){
    yield transform(item);
  }
};

let to_array = function(){
  return [...this];
};

let linqable = {where, select, to_array};

Object.assign(linq.prototype, linqable);
Object.assign(where.prototype, linqable);
Object.assign(select.prototype, linqable);


Array.prototype.as_queryable = function(){
  return linq(this);
}

let employees = [
  { name: 'Sam', age: 55 },
  { name: 'John', age: 27 },
  { name: 'Jessica', age: 30 },
  { name: 'Frodo', age: 34 },
  { name: 'Penelope', age: 39 }
];

let query =
  employees
    .as_queryable()
    .where(i=>i.age >= 35)
    .select(i => ({name: i.name, age: i.age + 100}))
    ;

console.log(query.to_array());