CODEWITHSUNDEEP
javascriptreactjs
mkEagles
mkEagles

Reputation: 338

Combinations of specific elements in array

Let's say that I'm doing this because of my homework. I would like to develop some kind of schedule for the week to come (array of 6-7 elements - output result). But I have one problem. I need to figure it out how one element be positioned in the array and also his frequency must be exactly what user input is. Elements must be positioned at different index in the array.

I'm having that kind of input from user (just an example);

var arrayOfElements = ["el1","el2","el3"];
var el1Frequency = 3;
var el2Frequency = 2;
var el3Frequency = 1;
//output array of schedule (this is just an example)
var finaloutPutArray = ["el1","el2","el3","el1","el2","el1"];

Index of elements el1 is 0, 3 and 5, basically, I don't want elements to be repeated like this; 

["el1","el1","el2","el3"...];
["el2","el1","el1","el3"];

Can you please give me some ideas on how to solve this problem.

I started like this;

var finalSchedule = [];

var totalDaysPerWeek = 6;
for(var i =0; i < totalDaysPerWeek; i++) {
  ...
}

Upvotes: 2

Views: 75

Answers (1)

Mos&#232; Raguzzini
Mos&#232; Raguzzini

Reputation: 15841

This is one pattern, check my working snippet:

var arrayOfElements = ["el1","el2","el3"];
var obj = { el1: 3,
            el2: 2,
            el3: 1};
                        
 // First determine the max recurring of an element, this will be the number of cycles fo your loop

// Check key values
var arr =  Object.keys(obj).map(function ( key ) { return obj[key]; });

// Get max value
var max = Math.max.apply( null, arr );
var finalArray = [];

// Iterate from 0 to max val
for(i = 0; i < max; i += 1){
  // Iterate on array of elements
  for(k = 0; k < arrayOfElements.length; k += 1) {
    // If config of recurring
    if( obj[arrayOfElements[k]] >= i+1 ) {
       // Push into array
       finalArray.push(arrayOfElements[k]);
    }
  }
}

console.log(finalArray);

Upvotes: 1

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