Check if a value exists in an object array without for loop

Question

"Roles":
{ 
    "0_A":["Developer"],
    "0_B":["Developer"],
    "0_C":["Developer","Tester","Player"],
    "0_D":["Tester"]
}

Is there a way to check if the value 'Player'/'Tester'/'Developer' exists anywhere in 'Roles' object? This is what I tried:

let isPlayer= false;
if (response) {
  const k = Object.keys(response["Roles"]);
  for (let index = 0; index < k.length; index++) {
    if (response["Roles"][k[index]].indexOf("Player") > -1) {
      isPlayer= true;
      break;
    }
  }    
}

Is there a way to do this without for loop?

Thank you!

Shidersz · Accepted Answer · 2019-04-08 20:10:53Z

1

One alternative is to use Array.some() in conjunction with Array.includes() over the Object.Values() of the input object. An example fo how to do this is shown on the below snippet:

const response = {};
response["Roles"] = {
  "0_A":["Developer"],
  "0_B":["Developer"],
  "0_C":["Developer","Tester","Player"],
  "0_D":["Tester"]
};

const checkForType = (resp, type) =>
{
    let typeExists = false;

    if (resp)
    {
        let roles = resp["Roles"] || {};
        typeExists = Object.values(roles).some(arr => arr.includes(type));
    }

    return typeExists;
}

console.log(checkForType(response, "Player"));
console.log(checkForType(response, "Developer"));
console.log(checkForType(response, "Team Leader"));

.as-console {background-color:black !important; color:lime;}
.as-console-wrapper {max-height:100% !important; top:0;}

answered Apr 8, 2019 at 20:10

Shidersz

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Comments

Arup Rakshit · Accepted Answer · 2019-04-08 19:22:32Z

1

How about using .find() and .includes as below:

let isPlayer = false;
if (response) {
  const roleNames = Object.values(response["Roles"]);
  const playerFound = roleNames.find(names => names.includes('Player'))
  isPlayer = !!playerFound;  
}

answered Apr 8, 2019 at 19:22

Arup Rakshit

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Comments

adiga · Accepted Answer · 2019-04-08 20:23:54Z

1

You could flatten the 2D array returned by Object.values() and use includes to check if the array contains the role name:

const response = {
  "Roles": {
    "0_A": ["Developer"],
    "0_B": ["Developer"],
    "0_C": ["Developer", "Tester", "Player"],
    "0_D": ["Tester"]
  }
}

let isPlayer = Object.values(response.Roles)
                      .flat()
                      .includes("Player")
                      
console.log(isPlayer)

answered Apr 8, 2019 at 20:23

adiga

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