Array.prototype.find to search an Object in an Array

Question

I am using Array.prototype.find to search an Object Person in an Array. I would like use the id to find this Object. I've been reading about the method find (ES6) but I don't know why my code is wrong.

This is my code:

AddresBook.prototype.getPerson = function (id) {

    return this.lisPerson.find(buscarPersona, id);

};

function buscarPersona(element, index, array) {
    if (element.id === this.id) {
        return element;
    } else
        return false;
}

Answer 1

You're passing the id directly as the thisArg parameter to .find(), but inside buscarPersona you expect this to be an object with a .id property. So either

• pass an object:

  lisPerson.find(buscarPersona, {id});
  function buscarPersona(element, index, array) {
      return element.id === this.id;
  }
  

• use this directly:

  lisPerson.find(buscarPersona, id);
  function buscarPersona(element, index, array) {
      // works in strict mode only, make sure to use it
      return element.id === this;
  }
  

• just pass a closure

  lisPerson.find(element => element.id === id);