-1
const role = [
{
 name: 'Hitman'
},
{
 name: 'Doctor'
},
{
 name: 'Nurse'
}
]

This is my array of objects now this is my users

const user = ['James', 'Harden']

notice there are only two, so only two random roles will used from my array of objects now the result i want is

 [
{
 name: 'Hitman'
 User: 'Harden'
},
{
 name: 'Nurse'
 User: 'James'
}
]

See, random user for a random role how can i do that?

Vcut Dev
  • 13
  • 2

3 Answers3

0

Use this answer to Get a random item from a JavaScript array

Use Array.map to loop through your users and choose a random role for each.

const role = [{
    name: 'Hitman'
  },
  {
    name: 'Doctor'
  },
  {
    name: 'Nurse'
  }
];

const user = ['James', 'Harden'];

const users = user.map(name => ({
  name: role[Math.floor(Math.random() * role.length)].name,
  User: name
}));

console.log(users);
Will
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  • In order the values to be unique, you need the name in the result to be this: `name: role.splice(Math.floor(Math.random() * role.length), 1)[0].name` – Nikita Skrebets Jan 13 '22 at 01:04
0

In order to do it uniquely, perform a random shuffle on the array, then assign the values sequentially...

// this thanks to https://stackoverflow.com/a/2450976/294949
function shuffle(array) {
  let currentIndex = array.length, randomIndex;
  while (currentIndex != 0) {
    // Pick a remaining element...
    randomIndex = Math.floor(Math.random() * currentIndex);
    currentIndex--;
    // And swap it with the current element.
    [array[currentIndex], array[randomIndex]] = [
      array[randomIndex], array[currentIndex]
    ];
  }
  return array;
}

let role = [{
    name: 'Hitman'
  },
  {
    name: 'Doctor'
  },
  {
    name: 'Nurse'
  }
];

shuffle(role);  // when this is run, the role array is randomly reordered

const user = ['James', 'Harden', 'Curry', 'Thompson', 'Green'];
// assign roles sequentially, like dealing cards from the top of a shuffled deck
const usersWithRoles = user.map((user, index) => {
  let roleName = index < role.length ? role[index].name : 'Hitman'
  return { name: user, roleName  };
});
console.log(usersWithRoles);
danh
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  • Thankyou but when the array is like this.. const user = ['James', 'Harden', 'Stephen', 'Curry'] notice there are only 3 roles which is Doctor Hitman and Nurse, now i want them to give all unique role, but! if all roles are taken i want the people who dont have unique role be a Hitman – Vcut Dev Jan 13 '22 at 13:24
  • Edited to provide a default value when the names exceed the roles. (And added more GS Warriors names :-) – danh Jan 13 '22 at 15:19
0

Another solution:

Since you want to prevent duplicate item from array, the best way is to copy the array and remove the specific item every time from the created array. This could keep the orignial data.

const role = [{ name: 'Hitman', img: 'hitman.png'},{ name: 'Doctor', img: 'doc.png'},{ name: 'Nurse', img: 'nurse.png'}]

const user = ['James', 'Harden', "Jason", "Iris"]
let test = []
let left = JSON.parse(JSON.stringify(role))
for (let i of user) {
  if (left.length > 0) {
    let ran = Math.floor(Math.random() * left.length)
    test.push({ user: i,name: left[ran].name,img: left[ran].img})
    left.splice(ran, 1)
  } else {
 test.push({user: i,name: "Hitman",img:'hitman.png'})
  }
}
console.log(test)
James
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  • Thankyou but when the array is like this.. const user = ['James', 'Harden', 'Stephen', 'Curry'] notice there are only 3 roles which is Doctor Hitman and Nurse, now i want them to give all unique role, but! if all roles are taken i want the people who dont have unique role be a Hitman – Vcut Dev Jan 13 '22 at 13:24
  • @VcutDev, just updated the code. Check if it works now and tell me：） – James Jan 13 '22 at 15:36