Creating an array based on specific conditions being satisfied (Using Javascript)

Question

Creating an array based on specific conditions being satisfied (Using Javascript)

I am struggling with a coding problem involving adding users to groups. The goal is to add each user to a group array, with a maximum of 3 users per group. If a group reaches 3 users, it should be moved to another array that collects all the groups. I then need to start a new group for the next 3 users until all users are assigned to groups.

Error -

let group[i] = [];

Unexpected token [

I've been working on this challenge for some time now and can't seem to crack it. It feels like I've hit a wall.

Here's the code snippet where I'm facing issues:

function createGroups(totalPeople){
  let i = 1
  let group[i] = [];
  let array = totalPeople

  totalPeople.map((user) => {

    if(group[i] < 3){
      group[i].push(user)
    }else{
      array.push(group[i]);
      i++
    }
  })
};

The 'totalPeople' array is generated earlier in my script, and this portion seems to be causing trouble. Any suggestions or corrections to help me solve this puzzle would be greatly appreciated! Thank you!

javascript arrays dynamic

Answer 1

Answer №1

Start by setting up the group as an array:

let count = 1
  let groupArr = [] // Initialized as an empty array
   groupArr[count] = [];
  let allPeople = totalPeople

  totalPeople.map((individual) => {

    if(groupArr[count] =< 3){
      groupArr[count].push(individual)
    }else{
      allPeople.push(groupArr[count]);
      count++
    }
  })

Answer 2

Start by setting up the group as an array:

let count = 1
  let groupArr = [] // Initialized as an empty array
   groupArr[count] = [];
  let allPeople = totalPeople

  totalPeople.map((individual) => {

    if(groupArr[count] =< 3){
      groupArr[count].push(individual)
    }else{
      allPeople.push(groupArr[count]);
      count++
    }
  })

Answer 3

Answer №2

Upon reviewing your code, several issues have been identified:

function createGroups(totalPeople){
  let i = 1
  let group[i] = []; // Issue #1: Declaration issue
  let array = totalPeople

  totalPeople.map((user) => {

    if(group[i] =< 3){ // Issues #2 and #3: Comparison problem 
      group[i].push(user)
    }else{
      array.push(group[i]); // Issue #4: Array push problem
      i++; // Issue #5: Increment problem
    }
  })
};

Issue #1:

The variable group needs to be defined as an array before assigning an index.

let group = []; 
group[i] = [];

Issue #2 :

You should compare the length of group[i] with 3 instead of the value itself.

Issue #3 :

Change the comparison operator from =< to <=. Keep in mind that arrays start at index 0.

Issue #4 :

Check if pushing to array, which refers to

totalPeople</code, produces the desired outcome. Consider using a new array to avoid modifying the original one passed as a parameter, following functional programming best practices.</p>

<p><strong>Issue #5 :</strong></p>

<p>If you increment <code>i

, ensure that group[i] is initialized as an array for subsequent loop iterations.

Different Approach:

After addressing the code issues, here's an alternative method using Array.prototype.reduce:

const totalPeople = ["Joe", "Jack", "Jerry", "Jane", "Mary", "Billy", "Vicky", "Bobby"];

const groupsOfThree = totalPeople.reduce((accumulator, currentPerson, index) => {

  accumulator[accumulator.length-1].push(currentPerson);

  if (index % 3 === 2) {
    accumulator.push([]);
  }

  return accumulator;
}, [[]]);

console.log(groupsOfThree);

Answer 4

Upon reviewing your code, several issues have been identified:

function createGroups(totalPeople){
  let i = 1
  let group[i] = []; // Issue #1: Declaration issue
  let array = totalPeople

  totalPeople.map((user) => {

    if(group[i] =< 3){ // Issues #2 and #3: Comparison problem 
      group[i].push(user)
    }else{
      array.push(group[i]); // Issue #4: Array push problem
      i++; // Issue #5: Increment problem
    }
  })
};

Issue #1:

The variable group needs to be defined as an array before assigning an index.

let group = []; 
group[i] = [];

Issue #2 :

You should compare the length of group[i] with 3 instead of the value itself.

Issue #3 :

Change the comparison operator from =< to <=. Keep in mind that arrays start at index 0.

Issue #4 :

Check if pushing to array, which refers to

totalPeople</code, produces the desired outcome. Consider using a new array to avoid modifying the original one passed as a parameter, following functional programming best practices.</p>

<p><strong>Issue #5 :</strong></p>

<p>If you increment <code>i

, ensure that group[i] is initialized as an array for subsequent loop iterations.

Different Approach:

After addressing the code issues, here's an alternative method using Array.prototype.reduce:

const totalPeople = ["Joe", "Jack", "Jerry", "Jane", "Mary", "Billy", "Vicky", "Bobby"];

const groupsOfThree = totalPeople.reduce((accumulator, currentPerson, index) => {

  accumulator[accumulator.length-1].push(currentPerson);

  if (index % 3 === 2) {
    accumulator.push([]);
  }

  return accumulator;
}, [[]]);

console.log(groupsOfThree);

Creating an array based on specific conditions being satisfied (Using Javascript)

Answer №1

Answer №2

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