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Piero Pajares
Asked: 2020-10-25 09:56:33 +0800 CST 2020-10-25 09:56:33 +0800 CST

Create dynamic object

  • 772

I have an array:

funciones = ['paciente.hospital', 'paciente.enfermad', 'paciente.documento'];

and a string:

const parametro = '72476675';

What I want to do is create a dynamic object from this array and this string so that it looks like this:

const result = {
   exp: 'paciente.hospitap',
   params: {
     exp: 'paciente.enfermedad',
     params: {
        exp: 'paciente.documento',
        params: parametro,
     }
   },
};

where the last function element will receive the parameter which is the string.

const result = {};
funciones.forEach((fn, i) => {
  if (i === funciones.length - 1) { // si es el ultimo le asignamos el parametro
     result.exp = parametro
  } else {
     // aqui no se como ir acumulando el objeto
     console.log(fn);
  }
});

The problem is that I don't know how to accumulate the object since this array of functions can have less or more elements.

javascript

2 Answers

  1. Using .reduceRigthit could be solved:

    const funciones = ['paciente.hospital', 'paciente.enfermad', 'paciente.documento'];


const parametro = '72476675';

const res = funciones.reduceRight((p, c) => {
    let t = ("params" in p)?{ ...p }:parametro;
    p.exp = c;
    p.params = t;
    return p;
}, {});

console.log(res);

    The idea would be to iterate from the right, and add the current object into a new object, the other case being the first time, an where we add parametro.

    • 3
  2. Best Answer

    Using array.reduceyou could get such a result.

    By iterating the array:
    - We create the properties expand paramsfor the object acc.
    - If it is the last value instead of assigning a {}to params, we assign parámetro.

    Example:

    const funciones = ['paciente.hospital', 'paciente.enfermad', 'paciente.documento'];
const parametro = '72476675';
const result = {};

funciones.reduce((acc, func, idx, arr) => {
  acc.exp = func;
  acc.params = (idx + 1 == arr.length) ? parametro : {};
  return acc.params;
}, result);

console.log(result);

    • 2