Array multi conditional filter using operators

Question

I have a data array that I want to filter based on if set variables are set to true or false. I want to write my code in a single function using operators (if possible) instead of having to code for every combination. My data sample looks like this:

chardata = [
     {
    "CharName": "Char1",
     "Magic": TRUE,
     "Melee": TRUE,
     "Ranged": TRUE
    },{
     "CharName": "Char2",
     "Magic": TRUE,
     "Melee": FALSE,
     "Ranged": FALSE
    },{
    "CharName": "Char3",
     "Magic": FALSE,
     "Melee": FALSE,
     "Ranged": TRUE
    }
]

I would like the filter to return Char1 whenever Magic and Ranged are set to true, but not return Char2 or Char3.

const filter = chardata.filter(function (ef) {
      return Magic === true ? 
      ef["Magic"] === true : "",
      Ranged === true ? 
      ef["Melee"] === true : "",
      Melee === true ? 
      ef["Ranged"] === true : ""})

Is is possible to make this work using this method or are are more than one functions needed?

Thanks

CertainPerformance · Accepted Answer · 2021-03-06 17:49:31Z

The main issue making a clean solution difficult is your Magic and Range variables, which are standalone instead of being in an easier to manage structure like an object.

Consolidate them into an object. Eg instead of

Magic = true;
Melee = false;
Ranged = true;

have

charType = {
  Magic: true,
  Melee: false,
  Ranged: true
}

Then you can do:

const filter = chardata.filter((oneChar) => {
  return Object.entries(charType)
    .filter(entry => entry[1])
    .every(([key, value]) => oneChar[key] === value);
});

Live demo:

chardata = [
     {
    "CharName": "Char1",
     "Magic": true,
     "Melee": true,
     "Ranged": true
    },{
     "CharName": "Char2",
     "Magic": true,
     "Melee": false,
     "Ranged": false
    },{
    "CharName": "Char3",
     "Magic": false,
     "Melee": false,
     "Ranged": true
    }
]

const charType = {
  Magic: true,
  Melee: false,
  Ranged: true
};


const filter = chardata.filter((oneChar) => {
  return Object.entries(charType)
    .filter(entry => entry[1])
    .every(([key, value]) => oneChar[key] === value);
});

console.log(filter);

strict mode

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