Deciding whether an array forms a chain of factors

I am curious about the reasons why this code is failing some of the tests provided. It deliberately avoids using any ES6 code.

Here is the given prompt:

*A factor chain can be defined as an array where each preceding element serves as a factor for the subsequent element. An example of a factor chain is shown below:

[3, 6, 12, 36]
// 3 is a factor of 6
// 6 is a factor of 12
// 12 is a factor of 36

The task at hand is to create a function that can determine whether or not a given array constitutes a factor chain.*

The following snippet showcases my approach:

function factorChain(arr) {
    var isChain = true;
  
  for (var i = 0; i < arr.length; i++) {
    if ((arr[i + 1] / arr[i]) !== Math.floor(arr[i + 1] / arr[i])) {
      isChain = false;            
    }
  }

  return isChain;
}

Answer №1

It is recommended to iterate up to arr.length - 1 as you need to access both the current index and the next index element in each iteration. Utilizing the modulus operator to determine if one number is a factor of another can improve the readability of the code. Additionally, there is no necessity to store the result in a variable; simply returning false when the condition is not met will terminate the function.

function checkFactorChain(arr) { 
  for (var i = 0; i < arr.length - 1; i++) {
    if (arr[i+1] % arr[i] != 0) {
      return false;            
    }
  }
  
  return true;
}

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