How to divide an unknown integer into a given number of even parts using Javascript

Question

I need help with the ability to divide an unknown integer into a given number of even parts — or at least as even as they can be. The sum of the parts should be the original

Answer 1

You may get maximum integer coefficient as x/y rounded down to integer and remainder with x%y. Than simply break remainder into 1's and add those 1's to corresponding number of items:

const breakIntoParts = (num, parts) => 
        [...Array(parts)].map((_,i) => 
          0|(i < num%parts ? num/parts+1 : num/parts))

console.log(JSON.stringify(breakIntoParts(20, 6)));

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Answer 2

Extremely simple solution:

const splitInteger = (number, parts) => {
    const remainder = number % parts
    const baseValue = (number - remainder) / parts

    return Array(parts).fill(baseValue).fill(baseValue + 1, parts - remainder)
}

To order from largest to smallest:

const splitInteger = (number, parts) => {
    const remainder = number % parts
    const baseValue = (number - remainder) / parts

    return Array(parts).fill(baseValue).fill(baseValue + 1, 0, remainder)
}

Now as an npm module: split-integer

Answer 3

Try like this.

var splitInteger = function(num, parts) {
  // Complete this function

  var val;
  var mod = num % parts;
  if(mod == 0){
    val = num/parts;
    retData = Array(parts).fill(val);
  } else {
    val = (num-mod)/parts;
    retData = Array(parts).fill(val);
    for(i=0;i<mod;i++){
      retData[i] = retData[i] + 1;
    }
    retData.reverse()
  }

  return retData;

}
var d = splitInteger(20, 6)
console.log(d);
console.log("sum - " + d.reduce(function(a,b){return a+b}));